HR: 11:20h
AN: SM12A-05    [Abstracts]
TI: Multiple Large Scale Energy Bands Inside the low Altitude Radiation Belts Caused by Human and Natural Waves
AU: Maggiolo, R
EM: romain.maggiolo@cesr.fr
AF: Centre d'Etude Spatiale des rayonnements, 9 avenue du colonel Roche, Toulouse, 31028, France
AU: * Sauvaud, J
EM: jean-andre.sauvaud@cesr.fr
AF: Centre d'Etude Spatiale des rayonnements, 9 avenue du colonel Roche, Toulouse, 31028, France
AU: Jacquey, C
EM: christian.jacquey@cesr.fr
AF: Centre d'Etude Spatiale des rayonnements, 9 avenue du colonel Roche, Toulouse, 31028, France
AU: Pincon, J
EM: jlpincon@cnrs-orleans.fr
AF: LPCE,CNRS-University of Orleans, 3 A Av de la Recherche Scientifique, Orleans, FRA 45071,
AU: Parrot, M
EM: mparrot@cnrs-orleans.fr
AF: LPCE,CNRS-University of Orleans, 3 A Av de la Recherche Scientifique, Orleans, FRA 45071,
AU: Berthelier, J
EM: jean-jacques.berthelier@cetp.ipsl.fr
AF: CETP, CNRS, avenue de Neptune, Saint Maur des Fosse, 78140, France
AB: The study of the radiation belts performed at low altitudes (600 km) onboard the Demeter satellite reveals several discrete large scale energy structures caused by the interaction of electrons with waves. Three of these structures are repeatdly observed: -i) An energy-L dispersed structure with one or two superposed energy bands due to the interaction of electrons with the powerfull NWC VLF transmitter at 19.8 kHz is seen during night, at L values between 1.4 and 2, when the transmitter is on; the energy of the resonating electron changes as a function of the season as expected from the variations of the density of the thermal plasma in the geomagnetic equatorial plane, -ii) A structure with superposed multiple energy bands is measured West of America inside the inner radiation belt (L=1.25-1.6), mainly during very active periods, with the electron energy spectra at a given location showing up to 10 peaks in the energy range from 70 keV to 1 MeV, and similarly, -iii) a structure with up to 12 energy peaks in the energy range from 200 kev to 2.5 MeV is measured west of South Africa at L Value of about 2.7. For these two last structures the multiple electron energy peaks are separated by the same energy at a given location. This is tentatively interpreted as indicating that these structures are due to the high orders resonance of electrons with whistler waves. Other possibilities are also presented and discussed.
DE: 2716 Energetic particles: precipitating
DE: 2720 Energetic particles: trapped
DE: 2774 Radiation belts
DE: 2788 Magnetic storms and substorms (7954)
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting