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Observation of ionospherically reflected quasiperiodic emissions by the DEMETER spacecraft
Author(s) -
Hanzelka Miroslav,
Santolík Ondřej,
Hajoš Mychajlo,
Němec František,
Parrot Michel
Publication year - 2017
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2017gl074883
Subject(s) - quasiperiodic function , poynting vector , whistler , physics , plasmasphere , spacecraft , ionosphere , hiss , geophysics , reflection (computer programming) , latitude , magnetosphere , computational physics , atmospheric sciences , meteorology , astronomy , magnetic field , electron , quantum mechanics , computer science , programming language , condensed matter physics
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.