Estimation of Ionospheric Conductivity Based on the Measurements by Superdarn

The ionosphere plays an important role in the electrodynamics of space environment. In particular, the information on the ionospheric conductivity distribution is indispensable in understanding the electrodynamics of the magnetosphere and ionosphere coupling study. To meet such a requirement, severa...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Eun Ah Lee [verfasserIn] Byung-Ho Ahn [verfasserIn] Yu Yi [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2002

Schlagwörter:	ionosphere conductance field aligned current

Übergeordnetes Werk:	In: Journal of Astronomy and Space Sciences - Korean Space Science Society (KSSS), 2012, 19(2002), 2, Seite 141-150
Übergeordnetes Werk:	volume:19 ; year:2002 ; number:2 ; pages:141-150

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc Journal toc

DOI / URN:	10.5140/JASS.2002.19.2.141

Katalog-ID:	DOAJ065181077

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520			\|a The ionosphere plays an important role in the electrodynamics of space environment. In particular, the information on the ionospheric conductivity distribution is indispensable in understanding the electrodynamics of the magnetosphere and ionosphere coupling study. To meet such a requirement, several attempts have been made to estimate the conductivity distribution over the polar ionosphere. As one of such attempts we compare the ionospheric plasma convection patterns obtained from the Super Dual Auroral Radar Network (SuperDARN), from which the electric field distribution is estimated, and the simultaneously measured ground magnetic disturbance. Specifically, the electric field measured from the Goose Bay and Stokkseyri radars and magnetic disturbance data obtained from the west coast chain of Greenland are compared. In order to estimate ionospheric conductivity distribution with these information, the overhead infinite sheet current approximation is employed. As expected, the Hall conductance, height-integrated conductivity, shows a wide enhancement along the center of the auroral electrojet. However, Pedersen conductance shows negative values over a wide portion of the auroral oval region, a physically unacceptable situation. To alleviate this problem, the effect of the field-aligned current is taken into account. As a result, the region with negative Pedersen conductance disappears significantly, suggesting that the effect of the field-aligned current should be taken into account, when one wants to estimate ionospheric conductance based on ground magnetic disturbance and electric field measurements by radars.
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allfields	10.5140/JASS.2002.19.2.141 doi (DE-627)DOAJ065181077 (DE-599)DOAJ458fe9c8d99a4a74bac2434d34200ea0 DE-627 ger DE-627 rakwb eng QB1-991 Eun Ah Lee verfasserin aut Estimation of Ionospheric Conductivity Based on the Measurements by Superdarn 2002 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The ionosphere plays an important role in the electrodynamics of space environment. In particular, the information on the ionospheric conductivity distribution is indispensable in understanding the electrodynamics of the magnetosphere and ionosphere coupling study. To meet such a requirement, several attempts have been made to estimate the conductivity distribution over the polar ionosphere. As one of such attempts we compare the ionospheric plasma convection patterns obtained from the Super Dual Auroral Radar Network (SuperDARN), from which the electric field distribution is estimated, and the simultaneously measured ground magnetic disturbance. Specifically, the electric field measured from the Goose Bay and Stokkseyri radars and magnetic disturbance data obtained from the west coast chain of Greenland are compared. In order to estimate ionospheric conductivity distribution with these information, the overhead infinite sheet current approximation is employed. As expected, the Hall conductance, height-integrated conductivity, shows a wide enhancement along the center of the auroral electrojet. However, Pedersen conductance shows negative values over a wide portion of the auroral oval region, a physically unacceptable situation. To alleviate this problem, the effect of the field-aligned current is taken into account. As a result, the region with negative Pedersen conductance disappears significantly, suggesting that the effect of the field-aligned current should be taken into account, when one wants to estimate ionospheric conductance based on ground magnetic disturbance and electric field measurements by radars. ionosphere conductance field aligned current Astronomy Byung-Ho Ahn verfasserin aut Yu Yi verfasserin aut In Journal of Astronomy and Space Sciences Korean Space Science Society (KSSS), 2012 19(2002), 2, Seite 141-150 (DE-627)62761471X (DE-600)2557343-3 20931409 nnns volume:19 year:2002 number:2 pages:141-150 https://doi.org/10.5140/JASS.2002.19.2.141 kostenfrei https://doaj.org/article/458fe9c8d99a4a74bac2434d34200ea0 kostenfrei http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2002/v19n2/OJOOBS_2002_v19n2_141.pdf kostenfrei https://doaj.org/toc/2093-5587 Journal toc kostenfrei https://doaj.org/toc/2093-1409 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 19 2002 2 141-150
spelling	10.5140/JASS.2002.19.2.141 doi (DE-627)DOAJ065181077 (DE-599)DOAJ458fe9c8d99a4a74bac2434d34200ea0 DE-627 ger DE-627 rakwb eng QB1-991 Eun Ah Lee verfasserin aut Estimation of Ionospheric Conductivity Based on the Measurements by Superdarn 2002 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The ionosphere plays an important role in the electrodynamics of space environment. In particular, the information on the ionospheric conductivity distribution is indispensable in understanding the electrodynamics of the magnetosphere and ionosphere coupling study. To meet such a requirement, several attempts have been made to estimate the conductivity distribution over the polar ionosphere. As one of such attempts we compare the ionospheric plasma convection patterns obtained from the Super Dual Auroral Radar Network (SuperDARN), from which the electric field distribution is estimated, and the simultaneously measured ground magnetic disturbance. Specifically, the electric field measured from the Goose Bay and Stokkseyri radars and magnetic disturbance data obtained from the west coast chain of Greenland are compared. In order to estimate ionospheric conductivity distribution with these information, the overhead infinite sheet current approximation is employed. As expected, the Hall conductance, height-integrated conductivity, shows a wide enhancement along the center of the auroral electrojet. However, Pedersen conductance shows negative values over a wide portion of the auroral oval region, a physically unacceptable situation. To alleviate this problem, the effect of the field-aligned current is taken into account. As a result, the region with negative Pedersen conductance disappears significantly, suggesting that the effect of the field-aligned current should be taken into account, when one wants to estimate ionospheric conductance based on ground magnetic disturbance and electric field measurements by radars. ionosphere conductance field aligned current Astronomy Byung-Ho Ahn verfasserin aut Yu Yi verfasserin aut In Journal of Astronomy and Space Sciences Korean Space Science Society (KSSS), 2012 19(2002), 2, Seite 141-150 (DE-627)62761471X (DE-600)2557343-3 20931409 nnns volume:19 year:2002 number:2 pages:141-150 https://doi.org/10.5140/JASS.2002.19.2.141 kostenfrei https://doaj.org/article/458fe9c8d99a4a74bac2434d34200ea0 kostenfrei http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2002/v19n2/OJOOBS_2002_v19n2_141.pdf kostenfrei https://doaj.org/toc/2093-5587 Journal toc kostenfrei https://doaj.org/toc/2093-1409 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 19 2002 2 141-150
allfields_unstemmed	10.5140/JASS.2002.19.2.141 doi (DE-627)DOAJ065181077 (DE-599)DOAJ458fe9c8d99a4a74bac2434d34200ea0 DE-627 ger DE-627 rakwb eng QB1-991 Eun Ah Lee verfasserin aut Estimation of Ionospheric Conductivity Based on the Measurements by Superdarn 2002 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The ionosphere plays an important role in the electrodynamics of space environment. In particular, the information on the ionospheric conductivity distribution is indispensable in understanding the electrodynamics of the magnetosphere and ionosphere coupling study. To meet such a requirement, several attempts have been made to estimate the conductivity distribution over the polar ionosphere. As one of such attempts we compare the ionospheric plasma convection patterns obtained from the Super Dual Auroral Radar Network (SuperDARN), from which the electric field distribution is estimated, and the simultaneously measured ground magnetic disturbance. Specifically, the electric field measured from the Goose Bay and Stokkseyri radars and magnetic disturbance data obtained from the west coast chain of Greenland are compared. In order to estimate ionospheric conductivity distribution with these information, the overhead infinite sheet current approximation is employed. As expected, the Hall conductance, height-integrated conductivity, shows a wide enhancement along the center of the auroral electrojet. However, Pedersen conductance shows negative values over a wide portion of the auroral oval region, a physically unacceptable situation. To alleviate this problem, the effect of the field-aligned current is taken into account. As a result, the region with negative Pedersen conductance disappears significantly, suggesting that the effect of the field-aligned current should be taken into account, when one wants to estimate ionospheric conductance based on ground magnetic disturbance and electric field measurements by radars. ionosphere conductance field aligned current Astronomy Byung-Ho Ahn verfasserin aut Yu Yi verfasserin aut In Journal of Astronomy and Space Sciences Korean Space Science Society (KSSS), 2012 19(2002), 2, Seite 141-150 (DE-627)62761471X (DE-600)2557343-3 20931409 nnns volume:19 year:2002 number:2 pages:141-150 https://doi.org/10.5140/JASS.2002.19.2.141 kostenfrei https://doaj.org/article/458fe9c8d99a4a74bac2434d34200ea0 kostenfrei http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2002/v19n2/OJOOBS_2002_v19n2_141.pdf kostenfrei https://doaj.org/toc/2093-5587 Journal toc kostenfrei https://doaj.org/toc/2093-1409 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 19 2002 2 141-150
allfieldsGer	10.5140/JASS.2002.19.2.141 doi (DE-627)DOAJ065181077 (DE-599)DOAJ458fe9c8d99a4a74bac2434d34200ea0 DE-627 ger DE-627 rakwb eng QB1-991 Eun Ah Lee verfasserin aut Estimation of Ionospheric Conductivity Based on the Measurements by Superdarn 2002 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The ionosphere plays an important role in the electrodynamics of space environment. In particular, the information on the ionospheric conductivity distribution is indispensable in understanding the electrodynamics of the magnetosphere and ionosphere coupling study. To meet such a requirement, several attempts have been made to estimate the conductivity distribution over the polar ionosphere. As one of such attempts we compare the ionospheric plasma convection patterns obtained from the Super Dual Auroral Radar Network (SuperDARN), from which the electric field distribution is estimated, and the simultaneously measured ground magnetic disturbance. Specifically, the electric field measured from the Goose Bay and Stokkseyri radars and magnetic disturbance data obtained from the west coast chain of Greenland are compared. In order to estimate ionospheric conductivity distribution with these information, the overhead infinite sheet current approximation is employed. As expected, the Hall conductance, height-integrated conductivity, shows a wide enhancement along the center of the auroral electrojet. However, Pedersen conductance shows negative values over a wide portion of the auroral oval region, a physically unacceptable situation. To alleviate this problem, the effect of the field-aligned current is taken into account. As a result, the region with negative Pedersen conductance disappears significantly, suggesting that the effect of the field-aligned current should be taken into account, when one wants to estimate ionospheric conductance based on ground magnetic disturbance and electric field measurements by radars. ionosphere conductance field aligned current Astronomy Byung-Ho Ahn verfasserin aut Yu Yi verfasserin aut In Journal of Astronomy and Space Sciences Korean Space Science Society (KSSS), 2012 19(2002), 2, Seite 141-150 (DE-627)62761471X (DE-600)2557343-3 20931409 nnns volume:19 year:2002 number:2 pages:141-150 https://doi.org/10.5140/JASS.2002.19.2.141 kostenfrei https://doaj.org/article/458fe9c8d99a4a74bac2434d34200ea0 kostenfrei http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2002/v19n2/OJOOBS_2002_v19n2_141.pdf kostenfrei https://doaj.org/toc/2093-5587 Journal toc kostenfrei https://doaj.org/toc/2093-1409 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 19 2002 2 141-150
allfieldsSound	10.5140/JASS.2002.19.2.141 doi (DE-627)DOAJ065181077 (DE-599)DOAJ458fe9c8d99a4a74bac2434d34200ea0 DE-627 ger DE-627 rakwb eng QB1-991 Eun Ah Lee verfasserin aut Estimation of Ionospheric Conductivity Based on the Measurements by Superdarn 2002 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The ionosphere plays an important role in the electrodynamics of space environment. In particular, the information on the ionospheric conductivity distribution is indispensable in understanding the electrodynamics of the magnetosphere and ionosphere coupling study. To meet such a requirement, several attempts have been made to estimate the conductivity distribution over the polar ionosphere. As one of such attempts we compare the ionospheric plasma convection patterns obtained from the Super Dual Auroral Radar Network (SuperDARN), from which the electric field distribution is estimated, and the simultaneously measured ground magnetic disturbance. Specifically, the electric field measured from the Goose Bay and Stokkseyri radars and magnetic disturbance data obtained from the west coast chain of Greenland are compared. In order to estimate ionospheric conductivity distribution with these information, the overhead infinite sheet current approximation is employed. As expected, the Hall conductance, height-integrated conductivity, shows a wide enhancement along the center of the auroral electrojet. However, Pedersen conductance shows negative values over a wide portion of the auroral oval region, a physically unacceptable situation. To alleviate this problem, the effect of the field-aligned current is taken into account. As a result, the region with negative Pedersen conductance disappears significantly, suggesting that the effect of the field-aligned current should be taken into account, when one wants to estimate ionospheric conductance based on ground magnetic disturbance and electric field measurements by radars. ionosphere conductance field aligned current Astronomy Byung-Ho Ahn verfasserin aut Yu Yi verfasserin aut In Journal of Astronomy and Space Sciences Korean Space Science Society (KSSS), 2012 19(2002), 2, Seite 141-150 (DE-627)62761471X (DE-600)2557343-3 20931409 nnns volume:19 year:2002 number:2 pages:141-150 https://doi.org/10.5140/JASS.2002.19.2.141 kostenfrei https://doaj.org/article/458fe9c8d99a4a74bac2434d34200ea0 kostenfrei http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2002/v19n2/OJOOBS_2002_v19n2_141.pdf kostenfrei https://doaj.org/toc/2093-5587 Journal toc kostenfrei https://doaj.org/toc/2093-1409 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 19 2002 2 141-150
language	English
source	In Journal of Astronomy and Space Sciences 19(2002), 2, Seite 141-150 volume:19 year:2002 number:2 pages:141-150
sourceStr	In Journal of Astronomy and Space Sciences 19(2002), 2, Seite 141-150 volume:19 year:2002 number:2 pages:141-150
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topic_facet	ionosphere conductance field aligned current Astronomy
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authorswithroles_txt_mv	Eun Ah Lee @@aut@@ Byung-Ho Ahn @@aut@@ Yu Yi @@aut@@
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callnumber-first	Q - Science
author	Eun Ah Lee
spellingShingle	Eun Ah Lee misc QB1-991 misc ionosphere misc conductance misc field aligned current misc Astronomy Estimation of Ionospheric Conductivity Based on the Measurements by Superdarn
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topic_title	QB1-991 Estimation of Ionospheric Conductivity Based on the Measurements by Superdarn ionosphere conductance field aligned current
topic	misc QB1-991 misc ionosphere misc conductance misc field aligned current misc Astronomy
topic_unstemmed	misc QB1-991 misc ionosphere misc conductance misc field aligned current misc Astronomy
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title	Estimation of Ionospheric Conductivity Based on the Measurements by Superdarn
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title_full	Estimation of Ionospheric Conductivity Based on the Measurements by Superdarn
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title_sort	estimation of ionospheric conductivity based on the measurements by superdarn
callnumber	QB1-991
title_auth	Estimation of Ionospheric Conductivity Based on the Measurements by Superdarn
abstract	The ionosphere plays an important role in the electrodynamics of space environment. In particular, the information on the ionospheric conductivity distribution is indispensable in understanding the electrodynamics of the magnetosphere and ionosphere coupling study. To meet such a requirement, several attempts have been made to estimate the conductivity distribution over the polar ionosphere. As one of such attempts we compare the ionospheric plasma convection patterns obtained from the Super Dual Auroral Radar Network (SuperDARN), from which the electric field distribution is estimated, and the simultaneously measured ground magnetic disturbance. Specifically, the electric field measured from the Goose Bay and Stokkseyri radars and magnetic disturbance data obtained from the west coast chain of Greenland are compared. In order to estimate ionospheric conductivity distribution with these information, the overhead infinite sheet current approximation is employed. As expected, the Hall conductance, height-integrated conductivity, shows a wide enhancement along the center of the auroral electrojet. However, Pedersen conductance shows negative values over a wide portion of the auroral oval region, a physically unacceptable situation. To alleviate this problem, the effect of the field-aligned current is taken into account. As a result, the region with negative Pedersen conductance disappears significantly, suggesting that the effect of the field-aligned current should be taken into account, when one wants to estimate ionospheric conductance based on ground magnetic disturbance and electric field measurements by radars.
abstractGer	The ionosphere plays an important role in the electrodynamics of space environment. In particular, the information on the ionospheric conductivity distribution is indispensable in understanding the electrodynamics of the magnetosphere and ionosphere coupling study. To meet such a requirement, several attempts have been made to estimate the conductivity distribution over the polar ionosphere. As one of such attempts we compare the ionospheric plasma convection patterns obtained from the Super Dual Auroral Radar Network (SuperDARN), from which the electric field distribution is estimated, and the simultaneously measured ground magnetic disturbance. Specifically, the electric field measured from the Goose Bay and Stokkseyri radars and magnetic disturbance data obtained from the west coast chain of Greenland are compared. In order to estimate ionospheric conductivity distribution with these information, the overhead infinite sheet current approximation is employed. As expected, the Hall conductance, height-integrated conductivity, shows a wide enhancement along the center of the auroral electrojet. However, Pedersen conductance shows negative values over a wide portion of the auroral oval region, a physically unacceptable situation. To alleviate this problem, the effect of the field-aligned current is taken into account. As a result, the region with negative Pedersen conductance disappears significantly, suggesting that the effect of the field-aligned current should be taken into account, when one wants to estimate ionospheric conductance based on ground magnetic disturbance and electric field measurements by radars.
abstract_unstemmed	The ionosphere plays an important role in the electrodynamics of space environment. In particular, the information on the ionospheric conductivity distribution is indispensable in understanding the electrodynamics of the magnetosphere and ionosphere coupling study. To meet such a requirement, several attempts have been made to estimate the conductivity distribution over the polar ionosphere. As one of such attempts we compare the ionospheric plasma convection patterns obtained from the Super Dual Auroral Radar Network (SuperDARN), from which the electric field distribution is estimated, and the simultaneously measured ground magnetic disturbance. Specifically, the electric field measured from the Goose Bay and Stokkseyri radars and magnetic disturbance data obtained from the west coast chain of Greenland are compared. In order to estimate ionospheric conductivity distribution with these information, the overhead infinite sheet current approximation is employed. As expected, the Hall conductance, height-integrated conductivity, shows a wide enhancement along the center of the auroral electrojet. However, Pedersen conductance shows negative values over a wide portion of the auroral oval region, a physically unacceptable situation. To alleviate this problem, the effect of the field-aligned current is taken into account. As a result, the region with negative Pedersen conductance disappears significantly, suggesting that the effect of the field-aligned current should be taken into account, when one wants to estimate ionospheric conductance based on ground magnetic disturbance and electric field measurements by radars.
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container_issue	2
title_short	Estimation of Ionospheric Conductivity Based on the Measurements by Superdarn
url	https://doi.org/10.5140/JASS.2002.19.2.141 https://doaj.org/article/458fe9c8d99a4a74bac2434d34200ea0 http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2002/v19n2/OJOOBS_2002_v19n2_141.pdf https://doaj.org/toc/2093-5587 https://doaj.org/toc/2093-1409
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up_date	2024-07-03T13:26:29.155Z
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