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The May 2‐3, 1986 magnetic storm: First energetic ion composition observations with the Mics instrument on Viking
Author(s) -
Stüdemann W.,
Wilken B.,
Kremser G.,
Korth A.,
Fennell J. F.,
Blake B.,
Koga R.,
Hall D.,
Bryant D.,
Søraas F.,
Brønstad K.,
Fritz T. A.,
Lundin R.,
Gloeckler G.
Publication year - 1987
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/gl014i004p00455
Subject(s) - ring current , magnetosphere , physics , proton , van allen probes , geomagnetic storm , ion , context (archaeology) , polar , energetic neutral atom , van allen radiation belt , solar wind , geophysics , atomic physics , magnetic field , astronomy , geology , nuclear physics , quantum mechanics , paleontology
Measurements with the Magnetospheric Ion Composition Spectrometer (MICS) onboard the polar orbiting Swedish satellite VIKING clearly show a strong asymmetry between the dusk‐ and dawnside ion distributions obtained after the onset of a magnetic storm on May 2‐3, 1986. The eveningside of the inner ring current region is quickly filled by protons with energies of some tens of keV. The morningside continues for several hours to show the quiet‐time inner ring current proton spectra in which protons below ∼100 keV have been removed due to charge‐exchange processes. The data obtained at high latitudes will be compared with measurements of the CHEM instrument on the AMPTE/CCE spacecraft near the equatorial plane. The observations are discussed in context of the convection of injected ions into the inner magnetosphere during magnetically active periods.