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Start Over "František Němec" Journal advances in space research
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3. MLR events and associated triggered emissions observed by DEMETER

Author

Michel Parrot, František Němec, Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National d’Études Spatiales [Paris] (CNES), Faculty of Mathematics and Physics [Praha/Prague], and Charles University [Prague] (CU)

Subjects
Physics, Atmospheric Science, 010504 meteorology & atmospheric sciences, Meteorology, Frequency band, Aerospace Engineering, Magnetic dip, Astronomy and Astrophysics, Harmonic radiation, Atmospheric sciences, 01 natural sciences, Geophysics, [SDU]Sciences of the Universe [physics], 13. Climate action, Space and Planetary Science, 0103 physical sciences, General Earth and Planetary Sciences, Spectrogram, Satellite, Emission spectrum, Ionosphere, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences, Line (formation)
Abstract

International audience; This paper gives an overview of different sets of new Magnetospheric Line Radiation (MLR) observed by the satellite DEMETER. Different types of emissions have been observed: emissions called Power Line Harmonic Radiation (PLHR) with frequency lines exactly separated by 50/100 or 60/120 Hz, emissions with frequency lines not exactly separated by 50/100 or 60/120 Hz and drifting in frequency (MLR). By comparison with past observations one can say that some MLR events are due to man-made PLHR which may suffer a non-linear gyro-resonant interaction at the magnetic equator. It is also shown that periodic emissions are very often associated with the MLR. In this case the origin of these waves is natural. The lines are produced by the periodicity and the frequency band limits of the individual elements which causes the appearance of lines on the spectrograms. Finally the paper shows that MLR can trigger emissions

Published
2009

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