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Dayside Pc5 pulsation detected by Viking ion data at L=4
Author(s) -
Yamauchi M.,
Lundin R.,
Mursula K.,
Marklund G.,
Potemra T. A.
Publication year - 1996
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 - 10.1029/96gl02140
Subject(s) - physics , ion , oscillation (cell signaling) , satellite , modulation (music) , ring current , flux (metallurgy) , latitude , magnetosphere , magnetic field , storm , atmospheric sciences , computational physics , meteorology , materials science , astronomy , chemistry , acoustics , metallurgy , quantum mechanics , biochemistry
On September 12, 1986, when the largest magnetic storm (Dst = −157 nT) during Viking operations took place, the satellite observed unusual energy modulation of sub‐keV ring current ions. The modulation is seen in both the pitch angle domain (conic‐like distribution) and the space‐time domain (wavy variation of ion flux with a period of a few minutes). The wavy variation is synchronized with a clear and distinct magnetic field‐line oscillation which is probably a standing Alfvén wave. This is observed simultaneously on the ground as a Pc5 pulsation over a wider range of latitude than the satellite observation.