Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33a1750s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM33A-1750
Physics
2483 Wave/Particle Interactions (7867), 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2720 Energetic Particles: Trapped, 2774 Radiation Belts
Scientific paper
The stably trapped electrons in the inner radiation belt have lifetimes of years and energies higher than a few hundred keV. These energetic electrons can have serious effects on the way spacecrafts and satellites operate and cause significant hazards to low Earth orbit (LEO) satellites. For mitigating these hazards it is necessary to investigate ways for reducing the electron life times, for example, through pitch angle scattering by waves. For these waves, the gyro-resoance condition yields the minimum wavelength requirement for given particle energy and local magnetic field. For example, at the magnetic equator at L = 2 the waves resonant with 1 MeV electrons should have wavelengths less than 10 km. Low frequency Electromagnetic Ion-Cyclotron (EMIC) waves occur in three bands with frequencies below the hydrogen, helium, and oxygen ion gyro-frequencies, respectively. At frequencies close to the ion gyro-frequencies, the EMIC waves can have wavelength short enough to gyro-resonate with energetic electrons, which can lead to significant changes in the lifetimes of electrons in the inner ration belt. However at these altitudes the amplitudes of naturally excited EMIC waves do not yield significant scattering of the energetic electrons and artificial sources are needed. In order to define the characteristics of such sources we investigated the lifetime of inner belt energetic electrons subject to pitch angle scattering with EMIC waves. The resonant wave characteristics are obtained using the global core plasma model (GCPM). The lifetimes of the electrons in the presence of these waves are computed using the pitch angle diffusion coefficient for broadband waves. For several hundred Watts of broadband EMIC waves in the shell volume enclosed by magnetic field lines at L = 2.0 with width dL = 0.1, the lifetime of 1 MeV electrons can be reduced to a few months. This is a considerable reduction compared to the average life times of about years and have important consequences, including remediation of artificially enhanced energetic electron fluxes.
Demekhov Andrei
Papadopoulos Konstantinos
Shao Xiaofeng
Sharma Surjalal A.
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