Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm52a..02h&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM52A-02
Physics
2774 Radiation Belts
Scientific paper
An extreme example of impulsive acceleration by radial transport of outer zone electrons into L=2.5 occurred on March 24, 1991, due to a high speed interplanetary shock produced by a Coronal Mass Ejection (CME). The magnetopause was compressed inside the orbit of geosynchronous spacecraft, producing new electron and proton radiation belts with energies > 10 MeV in the normally depleted slot region. Radial transport and energization of electrons occurred on a particle drift time scale of minutes due to the induction electric field launched by rapid magnetopause compression. The new > 10 MeV electron (and proton) belts produced inside geosynchronous orbit on the time scale of interplanetary shock passage persisted for years, as observed by the low altitude SAMPEX satellite in polar orbit, launched in 1992, viewing radiation belt particle precipitation into the atmosphere. A second example of this mechanism has been identified in the SAMPEX PET data at > 10 MeV with the passage of an interplanetary shock on February 21, 1994. While SAMPEX observes precipitation into the loss cone with delay relative to shock passage and storm sudden commencement, the event is clearly seen in situ at L = 2.5 in data from HEO spacecraft 1994-026, with 12 hour orbital resolution. Guiding center test particle simulations have been performed using MHD fields driven by upstream solar wind parameters measured by IMP 8 for the February 21, 1994 injection. It is fortunate that solar wind measurements were available for this storm, unlike March 1991, since it produced the second largest ground-based measurement of dBz/dt of the past solar cycle, mapping to an equatorial plane perturbation and corresponding azimuthal electric field responsible for prompt injection on an electron drift timescale in the March 1991 case, lacking corresponding solar wind input. Results for February 21, 1994 and March 24, 1991 relativistic electron injection events will be compared, along with the 2003 Halloween storm trapping of solar energetic electrons in the same energy range. Calculations are performed using the CMIT coupled magnetosphere-ionosphere MHD code developed by the Center for Integrated Space Weather Modeling, along with radiation belt test particle algorithms developed by and available from CISM.
Bernard Blake J.
Hudson Mary K.
Kress Brian T.
Merkin Viacheslav
Mueller Hans-Reinhard
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