Observation of ionospherically reflected quasiperiodic emissions by the DEMETER spacecraft

0479741 - ÚFA 2018 RIV US eng J - Článek v odborném periodiku
Hanzelka, Miroslav - Santolík, Ondřej - Hájoš, Mychajlo - Němec, F. - Parrot, M.
Observation of ionospherically reflected quasiperiodic emissions by the DEMETER spacecraft.
Geophysical Research Letters. Roč. 44, č. 17 (2017), s. 8721-8729, č. článku L074883. ISSN 0094-8276. E-ISSN 1944-8007
Grant CEP: GA MŠMT(CZ) LH15304; GA ČR(CZ) GA17-07027S
Grant ostatní: AV ČR(CZ) AP1401
Program: Akademická prémie - Praemium Academiae
Institucionální podpora: RVO:68378289
Klíčová slova: DEMETER * QP emissions * ray tracing * specular reflection
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 4.339, rok: 2017
http://onlinelibrary.wiley.com/doi/10.1002/2017GL074883/full

Quasiperiodic (QP) electromagnetic emissions are whistler mode waves at typical frequencies of a few kHz characterized by a periodic time modulation of their intensity. The DEMETER spacecraft observed events where the QP emissions exhibit a sudden change in the wave vector and Poynting vector directions. The change happens in a short interval of latitudes. We explain this behavior by ionospheric reflection and present a ray-tracing simulation which matches resulting wave vector directions. We also attempt to locate the source region of these emissions and conclude that they are most probably generated at the inner boundary of the plasmapause which also acts as a guide during the propagation of the QP emissions. ©2017. American Geophysical Union. All Rights Reserved.
Trvalý link: http://hdl.handle.net/11104/0275686