Mathematics – Probability
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43b..05p&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM43B-05
Mathematics
Probability
2483 Wave/Particle Interactions (7867), 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2720 Energetic Particles: Trapped, 2774 Radiation Belts
Scientific paper
Commercial electronics on LEO satellites are affected by protons in the 30-100 MeV range trapped in the inner radiation belt mainly when transiting the South Atlantic Anomaly (SAA). As the feature size of commercial electronic components shrinks to 65 nm, the probability of single event upsets increases by two to three orders of magnitude, reducing the utility of LEO orbiting satellites and making micro-satellites obsolete. Reduction of the flux of energetic protons in the inner belts,in the range of 1.5-1.8 becomes national priority. The paper examines the physics requirements for reducing the lifetime of the energetic protons in the inner belts from 10-20 years to 1-2 years. In reviewing the current understanding of the proton lifetimes we note that the lifetime of the outer belt protons is by more than four orders of magnitude shorter than in the inner belts. The reason for this sharp lifetime gradient is that the lifetime in the outer belts is controlled by fast pitch angle scattering of the protons into the loss cone by resonant interaction with naturally generated Alfven waves. Since these waves are constrained to regions with L>2, the inner belt lifetimes are controlled by slowing down of the protons exciting and ionizing oxygen atoms in the thermosphere. Results, obtained using a global plasma code indicate that injection of Alfven waves, from the ground or satellites, in the frequency range of 1-5 Hz with average amplitude 20-30 pT can reduce the energetic proton lifetime in the inner belts to 1- 2 years. The paper concludes by presenting the energy and power requirements for achieving such lifetime reduction as well as brief discussion.
Demekhov Andrei
Papadopoulos Konstantinos
Shao Xiaofeng
Sharma Surjalal A.
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