Observations of type 4 VHF radar doppler spectra during a Ps6 pulsation event
It has been suggested (Fejer et al., 1986, J. geophys. Res. 91, 13583) that type 4 auroral Doppler spectra are caused by a true two-stream instability in regions of enhanced electron temperature and intense electric fields. In such regions, type 4 spectra are expected to be observed when the Hall cu...
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Englisch |
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1991 |
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in: Planetary and Space Science - Amsterdam : Elsevier, 39(1991), 5, Seite 785-799 |
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volume:39 ; year:1991 ; number:5 ; pages:785-799 |
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| 520 | |a It has been suggested (Fejer et al., 1986, J. geophys. Res. 91, 13583) that type 4 auroral Doppler spectra are caused by a true two-stream instability in regions of enhanced electron temperature and intense electric fields. In such regions, type 4 spectra are expected to be observed when the Hall current direction becomes approximately parallel to the radar wave vector so that the latter is inside the two-stream unstable cone. The validity of this assumption is tested by the use of 50 and 60 MHz CW Doppler radar data during a Ps6 pulsation event. The CW radar data are supported with BARS (Bistatic Auroral Radar System) and MARIA (Magnetometer and Riometer Array) data, both instruments being parts of the CANOPUS program. It is demonstrated that type 4 irregularities are highly directional; most likely along the Hall current direction. The simultaneous observations of type 4 spectra by both CW radars favor the scaling of the Doppler shift according to transmitter frequency, although the observed type 4 Doppler velocity is found to be about 5% higher on 50 MHz than it is on 60 MHz. | ||
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(DE-627)NLEJ180265261 (DE-599)GBVNLZ180265261 DE-627 ger DE-627 rakwb eng Observations of type 4 VHF radar doppler spectra during a Ps6 pulsation event 1991 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier It has been suggested (Fejer et al., 1986, J. geophys. Res. 91, 13583) that type 4 auroral Doppler spectra are caused by a true two-stream instability in regions of enhanced electron temperature and intense electric fields. In such regions, type 4 spectra are expected to be observed when the Hall current direction becomes approximately parallel to the radar wave vector so that the latter is inside the two-stream unstable cone. The validity of this assumption is tested by the use of 50 and 60 MHz CW Doppler radar data during a Ps6 pulsation event. The CW radar data are supported with BARS (Bistatic Auroral Radar System) and MARIA (Magnetometer and Riometer Array) data, both instruments being parts of the CANOPUS program. It is demonstrated that type 4 irregularities are highly directional; most likely along the Hall current direction. The simultaneous observations of type 4 spectra by both CW radars favor the scaling of the Doppler shift according to transmitter frequency, although the observed type 4 Doppler velocity is found to be about 5% higher on 50 MHz than it is on 60 MHz. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Prikryl, P. oth Andre, D. oth Sofko, G.J. oth Koehler, J.A. oth Mckibben, M.J. oth Wallis, D.D. oth Hughes, T.J. oth McNamara, A.G. oth McDiarmid, D.R. oth McIntosh, B.A. oth Watermann, J. oth in Planetary and Space Science Amsterdam : Elsevier 39(1991), 5, Seite 785-799 (DE-627)NLEJ177225874 (DE-600)2012795-9 0032-0633 nnns volume:39 year:1991 number:5 pages:785-799 http://linkinghub.elsevier.com/retrieve/pii/0032-0633(91)90073-J GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 39 1991 5 785-799 |
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(DE-627)NLEJ180265261 (DE-599)GBVNLZ180265261 DE-627 ger DE-627 rakwb eng Observations of type 4 VHF radar doppler spectra during a Ps6 pulsation event 1991 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier It has been suggested (Fejer et al., 1986, J. geophys. Res. 91, 13583) that type 4 auroral Doppler spectra are caused by a true two-stream instability in regions of enhanced electron temperature and intense electric fields. In such regions, type 4 spectra are expected to be observed when the Hall current direction becomes approximately parallel to the radar wave vector so that the latter is inside the two-stream unstable cone. The validity of this assumption is tested by the use of 50 and 60 MHz CW Doppler radar data during a Ps6 pulsation event. The CW radar data are supported with BARS (Bistatic Auroral Radar System) and MARIA (Magnetometer and Riometer Array) data, both instruments being parts of the CANOPUS program. It is demonstrated that type 4 irregularities are highly directional; most likely along the Hall current direction. The simultaneous observations of type 4 spectra by both CW radars favor the scaling of the Doppler shift according to transmitter frequency, although the observed type 4 Doppler velocity is found to be about 5% higher on 50 MHz than it is on 60 MHz. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Prikryl, P. oth Andre, D. oth Sofko, G.J. oth Koehler, J.A. oth Mckibben, M.J. oth Wallis, D.D. oth Hughes, T.J. oth McNamara, A.G. oth McDiarmid, D.R. oth McIntosh, B.A. oth Watermann, J. oth in Planetary and Space Science Amsterdam : Elsevier 39(1991), 5, Seite 785-799 (DE-627)NLEJ177225874 (DE-600)2012795-9 0032-0633 nnns volume:39 year:1991 number:5 pages:785-799 http://linkinghub.elsevier.com/retrieve/pii/0032-0633(91)90073-J GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 39 1991 5 785-799 |
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(DE-627)NLEJ180265261 (DE-599)GBVNLZ180265261 DE-627 ger DE-627 rakwb eng Observations of type 4 VHF radar doppler spectra during a Ps6 pulsation event 1991 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier It has been suggested (Fejer et al., 1986, J. geophys. Res. 91, 13583) that type 4 auroral Doppler spectra are caused by a true two-stream instability in regions of enhanced electron temperature and intense electric fields. In such regions, type 4 spectra are expected to be observed when the Hall current direction becomes approximately parallel to the radar wave vector so that the latter is inside the two-stream unstable cone. The validity of this assumption is tested by the use of 50 and 60 MHz CW Doppler radar data during a Ps6 pulsation event. The CW radar data are supported with BARS (Bistatic Auroral Radar System) and MARIA (Magnetometer and Riometer Array) data, both instruments being parts of the CANOPUS program. It is demonstrated that type 4 irregularities are highly directional; most likely along the Hall current direction. The simultaneous observations of type 4 spectra by both CW radars favor the scaling of the Doppler shift according to transmitter frequency, although the observed type 4 Doppler velocity is found to be about 5% higher on 50 MHz than it is on 60 MHz. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Prikryl, P. oth Andre, D. oth Sofko, G.J. oth Koehler, J.A. oth Mckibben, M.J. oth Wallis, D.D. oth Hughes, T.J. oth McNamara, A.G. oth McDiarmid, D.R. oth McIntosh, B.A. oth Watermann, J. oth in Planetary and Space Science Amsterdam : Elsevier 39(1991), 5, Seite 785-799 (DE-627)NLEJ177225874 (DE-600)2012795-9 0032-0633 nnns volume:39 year:1991 number:5 pages:785-799 http://linkinghub.elsevier.com/retrieve/pii/0032-0633(91)90073-J GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 39 1991 5 785-799 |
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(DE-627)NLEJ180265261 (DE-599)GBVNLZ180265261 DE-627 ger DE-627 rakwb eng Observations of type 4 VHF radar doppler spectra during a Ps6 pulsation event 1991 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier It has been suggested (Fejer et al., 1986, J. geophys. Res. 91, 13583) that type 4 auroral Doppler spectra are caused by a true two-stream instability in regions of enhanced electron temperature and intense electric fields. In such regions, type 4 spectra are expected to be observed when the Hall current direction becomes approximately parallel to the radar wave vector so that the latter is inside the two-stream unstable cone. The validity of this assumption is tested by the use of 50 and 60 MHz CW Doppler radar data during a Ps6 pulsation event. The CW radar data are supported with BARS (Bistatic Auroral Radar System) and MARIA (Magnetometer and Riometer Array) data, both instruments being parts of the CANOPUS program. It is demonstrated that type 4 irregularities are highly directional; most likely along the Hall current direction. The simultaneous observations of type 4 spectra by both CW radars favor the scaling of the Doppler shift according to transmitter frequency, although the observed type 4 Doppler velocity is found to be about 5% higher on 50 MHz than it is on 60 MHz. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Prikryl, P. oth Andre, D. oth Sofko, G.J. oth Koehler, J.A. oth Mckibben, M.J. oth Wallis, D.D. oth Hughes, T.J. oth McNamara, A.G. oth McDiarmid, D.R. oth McIntosh, B.A. oth Watermann, J. oth in Planetary and Space Science Amsterdam : Elsevier 39(1991), 5, Seite 785-799 (DE-627)NLEJ177225874 (DE-600)2012795-9 0032-0633 nnns volume:39 year:1991 number:5 pages:785-799 http://linkinghub.elsevier.com/retrieve/pii/0032-0633(91)90073-J GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 39 1991 5 785-799 |
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(DE-627)NLEJ180265261 (DE-599)GBVNLZ180265261 DE-627 ger DE-627 rakwb eng Observations of type 4 VHF radar doppler spectra during a Ps6 pulsation event 1991 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier It has been suggested (Fejer et al., 1986, J. geophys. Res. 91, 13583) that type 4 auroral Doppler spectra are caused by a true two-stream instability in regions of enhanced electron temperature and intense electric fields. In such regions, type 4 spectra are expected to be observed when the Hall current direction becomes approximately parallel to the radar wave vector so that the latter is inside the two-stream unstable cone. The validity of this assumption is tested by the use of 50 and 60 MHz CW Doppler radar data during a Ps6 pulsation event. The CW radar data are supported with BARS (Bistatic Auroral Radar System) and MARIA (Magnetometer and Riometer Array) data, both instruments being parts of the CANOPUS program. It is demonstrated that type 4 irregularities are highly directional; most likely along the Hall current direction. The simultaneous observations of type 4 spectra by both CW radars favor the scaling of the Doppler shift according to transmitter frequency, although the observed type 4 Doppler velocity is found to be about 5% higher on 50 MHz than it is on 60 MHz. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Prikryl, P. oth Andre, D. oth Sofko, G.J. oth Koehler, J.A. oth Mckibben, M.J. oth Wallis, D.D. oth Hughes, T.J. oth McNamara, A.G. oth McDiarmid, D.R. oth McIntosh, B.A. oth Watermann, J. oth in Planetary and Space Science Amsterdam : Elsevier 39(1991), 5, Seite 785-799 (DE-627)NLEJ177225874 (DE-600)2012795-9 0032-0633 nnns volume:39 year:1991 number:5 pages:785-799 http://linkinghub.elsevier.com/retrieve/pii/0032-0633(91)90073-J GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 39 1991 5 785-799 |
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Observations of type 4 VHF radar doppler spectra during a Ps6 pulsation event |
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It has been suggested (Fejer et al., 1986, J. geophys. Res. 91, 13583) that type 4 auroral Doppler spectra are caused by a true two-stream instability in regions of enhanced electron temperature and intense electric fields. In such regions, type 4 spectra are expected to be observed when the Hall current direction becomes approximately parallel to the radar wave vector so that the latter is inside the two-stream unstable cone. The validity of this assumption is tested by the use of 50 and 60 MHz CW Doppler radar data during a Ps6 pulsation event. The CW radar data are supported with BARS (Bistatic Auroral Radar System) and MARIA (Magnetometer and Riometer Array) data, both instruments being parts of the CANOPUS program. It is demonstrated that type 4 irregularities are highly directional; most likely along the Hall current direction. The simultaneous observations of type 4 spectra by both CW radars favor the scaling of the Doppler shift according to transmitter frequency, although the observed type 4 Doppler velocity is found to be about 5% higher on 50 MHz than it is on 60 MHz. |
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It has been suggested (Fejer et al., 1986, J. geophys. Res. 91, 13583) that type 4 auroral Doppler spectra are caused by a true two-stream instability in regions of enhanced electron temperature and intense electric fields. In such regions, type 4 spectra are expected to be observed when the Hall current direction becomes approximately parallel to the radar wave vector so that the latter is inside the two-stream unstable cone. The validity of this assumption is tested by the use of 50 and 60 MHz CW Doppler radar data during a Ps6 pulsation event. The CW radar data are supported with BARS (Bistatic Auroral Radar System) and MARIA (Magnetometer and Riometer Array) data, both instruments being parts of the CANOPUS program. It is demonstrated that type 4 irregularities are highly directional; most likely along the Hall current direction. The simultaneous observations of type 4 spectra by both CW radars favor the scaling of the Doppler shift according to transmitter frequency, although the observed type 4 Doppler velocity is found to be about 5% higher on 50 MHz than it is on 60 MHz. |
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It has been suggested (Fejer et al., 1986, J. geophys. Res. 91, 13583) that type 4 auroral Doppler spectra are caused by a true two-stream instability in regions of enhanced electron temperature and intense electric fields. In such regions, type 4 spectra are expected to be observed when the Hall current direction becomes approximately parallel to the radar wave vector so that the latter is inside the two-stream unstable cone. The validity of this assumption is tested by the use of 50 and 60 MHz CW Doppler radar data during a Ps6 pulsation event. The CW radar data are supported with BARS (Bistatic Auroral Radar System) and MARIA (Magnetometer and Riometer Array) data, both instruments being parts of the CANOPUS program. It is demonstrated that type 4 irregularities are highly directional; most likely along the Hall current direction. The simultaneous observations of type 4 spectra by both CW radars favor the scaling of the Doppler shift according to transmitter frequency, although the observed type 4 Doppler velocity is found to be about 5% higher on 50 MHz than it is on 60 MHz. |
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<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000caa a22002652 4500</leader><controlfield tag="001">NLEJ180265261</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20210706122943.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">070505s1991 xx |||||o 00| ||eng c</controlfield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)NLEJ180265261</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-599)GBVNLZ180265261</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rakwb</subfield></datafield><datafield tag="041" ind1=" " ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Observations of type 4 VHF radar doppler spectra during a Ps6 pulsation event</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">1991</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zzz</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">z</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zu</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">It has been suggested (Fejer et al., 1986, J. geophys. Res. 91, 13583) that type 4 auroral Doppler spectra are caused by a true two-stream instability in regions of enhanced electron temperature and intense electric fields. In such regions, type 4 spectra are expected to be observed when the Hall current direction becomes approximately parallel to the radar wave vector so that the latter is inside the two-stream unstable cone. The validity of this assumption is tested by the use of 50 and 60 MHz CW Doppler radar data during a Ps6 pulsation event. The CW radar data are supported with BARS (Bistatic Auroral Radar System) and MARIA (Magnetometer and Riometer Array) data, both instruments being parts of the CANOPUS program. It is demonstrated that type 4 irregularities are highly directional; most likely along the Hall current direction. The simultaneous observations of type 4 spectra by both CW radars favor the scaling of the Doppler shift according to transmitter frequency, although the observed type 4 Doppler velocity is found to be about 5% higher on 50 MHz than it is on 60 MHz.</subfield></datafield><datafield tag="533" ind1=" " ind2=" "><subfield code="f">Elsevier Journal Backfiles on ScienceDirect 1907 - 2002</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Prikryl, P.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Andre, D.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Sofko, G.J.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Koehler, J.A.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Mckibben, M.J.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Wallis, D.D.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Hughes, T.J.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">McNamara, A.G.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">McDiarmid, D.R.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">McIntosh, B.A.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Watermann, J.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">in</subfield><subfield code="t">Planetary and Space Science</subfield><subfield code="d">Amsterdam : Elsevier</subfield><subfield code="g">39(1991), 5, Seite 785-799</subfield><subfield code="w">(DE-627)NLEJ177225874</subfield><subfield code="w">(DE-600)2012795-9</subfield><subfield code="x">0032-0633</subfield><subfield code="7">nnns</subfield></datafield><datafield tag="773" ind1="1" ind2="8"><subfield code="g">volume:39</subfield><subfield code="g">year:1991</subfield><subfield code="g">number:5</subfield><subfield code="g">pages:785-799</subfield></datafield><datafield tag="856" ind1="4" ind2="0"><subfield code="u">http://linkinghub.elsevier.com/retrieve/pii/0032-0633(91)90073-J</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_USEFLAG_H</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">ZDB-1-SDJ</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_NL_ARTICLE</subfield></datafield><datafield tag="951" ind1=" " ind2=" "><subfield code="a">AR</subfield></datafield><datafield tag="952" ind1=" " ind2=" "><subfield code="d">39</subfield><subfield code="j">1991</subfield><subfield code="e">5</subfield><subfield code="h">785-799</subfield></datafield></record></collection>
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