Substorm related energy-latitude dispersion of energetic ions in the dayside magnetosphere - Viking observations

Details Substorm related energy-latitude dispersion of energetic ions in the dayside magnetosphere - Viking observations Substorm related energy-latitude dispersion of energetic ions in the dayside magnetosphere - Viking observations

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..628r&link_type=abstract

Annales Geophysicae (ISSN 0939-4176), vol. 9, Sept. 1991, p. 628-639. Research supported by Academy of Finland and Swedish Board

Physics

1

Energetic Particles, Energy Distribution, Magnetic Storms, Magnetospheric Ion Density, Satellite Observation, Helium Ions, Hydrogen Ions, Oxygen Ions, Polar Orbits, Viking Spacecraft

Scientific paper

Measurements by the Magnetospheric Ion Composition Spectrometer onboard the Swedish polar orbiting satellite Viking were used to investigate a new type of energy-latitude dispersion phenomena of high energy ions (10-326 keV/e). The dispersion events occur on the dayside (0800-1500 MLT) at invariant latitudes of about 69-77 deg, i.e., just equatorward of the cleft region. During medium geomagnetic activity (Kp between 2- and 3), the occurrence frequency has a maximum in the early afternoon sector. The dispersion is observed for H(+), He(+), He(2+) and O(+) ions. The ion energy increases with decreasing latitude from a few tens of a keV/e at the high-latitude edge up to some hundreds of keV/e at the lowest latitudes. It is argued that the events are formed by ion drift in the equatorial plane from the nightside to the dayside and subsequent pitch angle diffusion, that transports part of the ions to Viking altitudes. Drift calculations show that the source region of the ions is located close to the nightside trapping boundary. Possible reasons for the energy dispersion are discussed.

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