Statistics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43b1489p&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM43B-1489
Statistics
2431 Ionosphere/Magnetosphere Interactions (2736), 2455 Particle Precipitation, 2483 Wave/Particle Interactions (7867), 2716 Energetic Particles: Precipitating, 3324 Lightning
Scientific paper
Lightning discharges are known to produce intense electromagnetic radiation in VLF range. This electromagnetic radiation propagates into the magnetosphere where it can interact with radiation belt electrons and produce Lighting-induced Electron Precipitation (LEP). Relatively few examples of LEP events have been observed directly on the S81-1 (SEEP) satellite [e.g., Voss et al., 1998] while many observations of LEP events have been reported with the ground-based subionospheric VLF methods [e.g., Peter and Inan, 2004 and references therein] . In this work we present the first direct measurements of LEP spectra with a particle detector onboard DEMETER satellite. DEMETER is a low-earth orbit satellite (660 km) capable of simultaneous registering the flux of energetic electrons in 256 channels from 70 keV to 2.5 MeV and broadband electromagnetic waveforms up to 20 kHz. This instrument constellation allows unambiguous detection of lightning (as spherics and whistlers) and corresponding LEP events (as bursts of particle flux) over the regions traversed by the satellite. We present statistics of LEP event observations from a three month' period over Europe and contiguous United States. Results indicate that LEP events are harder to detect on the satellite over the US because the transient bursts are often buried behind the high background of energetic particle flux at these longitudes to the west of the South Atlantic Anomaly. On the other hand, in Europe LEP events are clearly distinguished because the background flux is much lower since the trapped energetic particles have precipitated from the drift-loss cone during their passage over South America magnetic anomaly.
Inan Umran S.
Parrot Michel
Piddyachiy D.
Sauvaud J. J.
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