Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13b2062n&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM13B-2062
Physics
Plasma Physics
[2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2778] Magnetospheric Physics / Ring Current, [6984] Radio Science / Waves In Plasma, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
Magnetospheric Line Radiation (MLR) events are electromagnetic waves in the frequency range from about 1 to 8 kHz observed both by low-altitude satellites and on the ground that - when represented in a traditional form of frequency-time spectrograms - consist of several nearly horizontal and almost parallel intense lines. Although their existence is known for quite a long time, their origin is still not understood. We analyze the MLR events observed by the DEMETER satellite (altitude about 700 km, nearly Sun-synchronous orbit at 10:30/22:30 LT) during more than 6 years of its mission. This enormous set of data enabled us to compile the largest data set of the satellite observations of MLR events available up to date. We systematically analyze the events, paying a special attention to the frequency spacing between individual lines and their drift rate. DEMETER measurements of energetic particles are used in addition to the wave measurements in order to try to understand the wave-particle interactions taking place. Finally, we have identified an MLR event observed simultaneously by DEMETER and the Cluster spacecraft in the equatorial region at L~4. A detailed wave analysis of the STAFF-SA measurements on board Cluster reveals that the spacecraft were most likely located in the source region of the MLR event. We perform a detailed analysis of this exceptional observation.
Němec Frantisek
Parrot Michel
Santolik Ondrej
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