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Published 1996 | Published
Book Section - Chapter Open

Measurements of the ionic charge states of solar energetic particles at 15–70 MeV/nucleon using the geomagnetic field


The mean charge states of abundant heavy ions with ∼15–70 MeV nucleon ^(−1) in the two large solar energetic particle events of 1992 October 30 and November 2 have been determined using measurements of the invariant latitude of the cosmic ray geomagnetic cutoffs as a function of time, particle energy, and element from the Mass Spectrometer Telescope on the polar‐orbiting SAMPEX satellite. The deduced charge state values are in good agreement with the mean values measured directly in previous solar energetic particle events at much lower energies of ∼1 MeV nucleon ^(−1), with inferred equilibrium source temperatures of typically 2×10^6 K. This result provides additional evidence that solar energetic particles in gradual‐type events consist of accelerated coronal material.

Additional Information

© 1996 American Institute of Physics. This work was supported by NASA under contract NAS5-30704 and grant NAGW-1919.

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August 20, 2023
January 13, 2024