Satellite observations of Magnetospheric Line Radiation

Details Satellite observations of Magnetospheric Line Radiation Satellite observations of Magnetospheric Line Radiation

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm11b0321n&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM11B-0321

Physics

2772 Plasma Waves And Instabilities (2471)

Scientific paper

Results of a systematic survey of Magnetospheric Line Radiation (MLR) observed by the DEMETER spacecraft (launched in June, 2004, inclination ~98 degrees, altitude ~700 km, designed to study electromagnetic phenomena connected with seismic or man-made activity) are presented. In order to obtain a statistically significant data set, an automatic identification procedure of possible MLR events has been developed and applied to all the data measured since the beginning of the mission. We show that there are two principally different classes of events: 1) Events with frequency spacing of 50/100 or 60/120 Hz (Power Line Harmonic Radiation, PLHR). The artificial origin of these events from power systems is demonstrated by tracing magnetic field lines to the possible regions of generation. Effects of several parameters (peak intensity, magnetic local time, Kp index, number of lines, frequency) are studied. 2) Events with frequency spacing different from frequencies of power systems ("real-MLR"). Since these emissions usually occur at lower frequencies, it is in many cases possible to use ELF data, where all the 6 components of the electromagnetic field are measured during the Burst mode. We perform a detailed analysis of these events, classifying them into several groups. There is no evidence for their artificial origin.

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