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GEOPHYSICAL RESEARCH LETTERS,
VOL. 36,
L22103,
4 PP., 2009
doi:10.1029/2009GL040974
Conjugate observations on board a satellite and on the ground of a remarkable MLR-like event
Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, CNRS, Orléans, France
Institute of Atmospheric Physics, ASCR, Prague, Czech Republic
Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
Sodankylä Geophysical Observatory, Sodankylä, Finland
Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, CNRS, Orléans, France
Institute of Atmospheric Physics, ASCR, Prague, Czech Republic
Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
Sodankylä Geophysical Observatory, Sodankylä, Finland
Electromagnetic waves observed by low-altitude satellites and on the ground have sometimes – when represented as a frequency-time spectrogram – a form of several nearly parallel and almost equidistant clearly defined lines at frequencies between 1 and 8 kHz. These may drift in frequency and they are usually called Magnetospheric Line Radiation (MLR). Although they have been known for a long time, their origin is still unclear. We present an experimental study using both ground-based and satellite data, showing for the first time a detailed analysis of the simultaneous observations of an MLR-like event on the ground and in the conjugate region. We demonstrate that the individual lines forming the event result (at least in this particular case) from elements reflected between the northern and southern hemispheres.
Received 13 September 2009; accepted 22 October 2009; published 20 November 2009.
Citation: (2009), Conjugate observations on board a satellite and on the ground of a remarkable MLR-like event, Geophys. Res. Lett., 36, L22103, doi:10.1029/2009GL040974.
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