Storm-associated variations of equatorially mirroring ring current protons, 1-800 keV, at constant first adiabatic invariant

Details Storm-associated variations of equatorially mirroring ring current protons, 1-800 keV, at constant first adiabatic invariant Storm-associated variations of equatorially mirroring ring current protons, 1-800 keV, at constant first adiabatic invariant

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81..216l&link_type=abstract

Journal of Geophysical Research, vol. 81, Jan. 1, 1976, p. 216-220.

Physics

13

Equatorial Electrojet, Magnetic Storms, Proton Belts, Ring Currents, Explorer Satellites, Magnetic Variations, Plasmapause, Solar Protons

Scientific paper

Explorer 45 observations of ring current protons mirroring near the equator, 1-800 keV, are presented at constant first adiabatic invariant mu throughout the period of the December 17, 1971, geomagnetic storm. The parameter mu is obtained from simultaneous magnetic field and particle observations. Particle deceleration in response to the storm time magnetic field decrease causes ring current measurements viewed at constant energy to underestimate the storm time increase in proton intensities at energies not exceeding 200 keV. This adiabatic deceleration also accounts for the large flux decreases observed at energies above 200 keV during the storm, in contradiction with previous results (Soraas and Davis, 1968) obtained using a model for the storm time magnetic field.

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