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The effect of the shock of 15:43 UT March 23, 1991 on 50 keV to 5 MeV ions at Ulysses
Author(s) -
Armstrong T. P.,
Choo T. H.,
Roelof E. C.,
Simnett G. M.,
Sarris E. T.
Publication year - 1992
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/92gl00777
Subject(s) - physics , shock (circulatory) , ion , spectral line , interplanetary spaceflight , shock wave , intensity (physics) , atomic physics , astrophysics , solar wind , nuclear physics , astronomy , mechanics , plasma , optics , medicine , quantum mechanics
The intensities, angular distributions, and energy spectra of 50 keV to 5 MeV ions are examined in the several hour time interval when an interplanetary shock passed the Ulysses spacecraft. The increase in intensity, evolution of pitch angle distribution from upstream flow away from the shock to a post‐shock “pancake” distribution, the earlier arrival of more energetic particles, and the presence of non‐gyrotropic effects at the time of shock passage all can be understood in terms of kinematical behavior of the particles crossing the shock.