A raytracing study of equatorial noise emissions observed by the DEMETER spacecraft

0446700 - ÚFA 2016 CZ eng A - Abstract
Hanzelka, M. - Němec, F. - Santolík, Ondřej - Parrot, M. - Sochorová, Zuzana
A raytracing study of equatorial noise emissions observed by the DEMETER spacecraft.
26th IUGG General Assembly 2015. Earth and Environmental Sciences for Future Generations : abstracts. Prague: International Union of Geodesy and Geophysics, 2015. A21p-259.
[Earth and Environmental Sciences for Future Generations. General Assembly of International Union of Geodesy and Geophysics /26./. 22.06.2015-02.07.2015, Prague]
Institutional support: RVO:68378289
Keywords : DEMETER spacecraft * geomagnetic storm
Subject RIV: DG - Athmosphere Sciences, Meteorology
http://www.iugg2015prague.com/abstractcd/data/HtmlApp/main.html#1

Equatorial noise is a type of electromagnetic wave emission in the frequency range between the proton cyclotron frequency and the lower hybrid frequency. Usually, it is encountered at higher L-shells (2-7) and within a few degrees of the geomagnetic equator. However, we show that during geomagnetic storms equatorial noise emissions can be detected by DEMETER at altitudes of about 700 km and in the latitudinal range of -20 to 20 degrees. We explain the preferential storm-time occurrence of equatorial noise observed by DEMETER by the L=0 cutoff frequency at the spacecraft location, along with the source region of the emissions located in the equatorial region close to the plasmapause. We perform a raytracing study of equatorial noise propagation from the expected source region down to the DEMETER altitudes, and we compare the calculated latitudinal dependencies of wave polarization parameters with the latitudinal dependencies determined from the DEMETER multicomponent electromagnetic data.
Permanent Link: http://hdl.handle.net/11104/0248920