Radial diffusion of relativistic electrons into the radiation belt slot region during the 2003 Halloween geomagnetic storms

Details Radial diffusion of relativistic electrons into the radiation belt slot region during the 2003 Halloween geomagnetic storms Radial diffusion of relativistic electrons into the radiation belt slot region during the 2003 Halloween geomagnetic storms

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm33a0425l&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM33A-0425

Physics

2730 Magnetosphere: Inner, 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954), 7807 Charged Particle Motion And Acceleration, 7845 Particle Acceleration

Scientific paper

A study was undertaken to estimate the radial diffusion time-scale, τLL, for relativistic electrons (2-6 MeV) to diffuse into the slot region due to drift-resonance with Pc5 ULF waves (2-10 mHz) on 29th October, 2003. Large amplitude ULF waves were observed by the CARISMA, SAMNET and IMAGE ground-based magnetometer arrays to penetrate deep into the slot region ( L~eq2-3) starting at 0600 UT and maximising (~200 nT p-p) between 0930-1630 UT. Around the same time, the SAMPEX PET instrument measured an over two orders of magnitude increase in relativistic (2-6 MeV) electron flux levels in ~24 hours within the slot region. The ground-based D-component magnetic power spectral densities (PSDδ B) for 29th October were estimated for six latitudinally spaced ground stations covering L~2.3-4.3 for an observed ULF wave with central frequency ~4 mHz. The PSDδ B values were used to calculate the in-situ equatorial poloidal wave electric field power spectral densities (PSDδ Em) using a standing Alfvén wave model. The radial diffusion coefficients, DLL, were estimated using the PSDδ Em values. The τLL over the L-range L~2.3-3.3 were consistent with the time-scales observed by the SAMPEX for the increase in relativistic fluxes in the slot region on 29th October, 2003. The authors believe that this is the first example of the ULF wave drift-resonance with relativistic electrons explaining a radiation belt slot region filling event.

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