A new type of ion injection event observed by Viking

Details A new type of ion injection event observed by Viking A new type of ion injection event observed by Viking

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..795y&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 9, p. 795-798.

Physics

11

Ion Injection, Solar Terrestrial Interactions, Solar Wind, Space Plasmas, Viking Spacecraft, Electric Fields, Geomagnetism, Magnetosheath

Scientific paper

The discovery of a new type of low-energy (less than 200 eV) plasma injection event near local noon several degrees equatorward of the cusp is reported. Its V-shaped energy-pitch angle pattern is very similar to that of impulsive or transient magnetosheath plasma injection events reported in the past. Thus, the source region of these injected particles is not a persistent one and it is likely of magnetosheath origin. The magnetic field and the electric field observations do not exhibit a strong electromagnetic coupling between the ionosphere and the source region. A high-energy (greater than 300 eV) population is absent, making the ion energy-time dispersion very weak. This event does not seem to be related to either any solar wind density increase or southward/disturbed interplanetary magnetic field conditions. It is suggested that this is a more stagnant phenomenon.

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