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Association of Low‐Charge‐State Heavy Ions up to 200 R e upstream of the Earth's bow shock with geomagnetic disturbances
Author(s) -
Posner Arik,
Schwadron Nathan A.,
Zurbuchen Thomas H.,
Kozyra Janet U.,
Liemohn Michael W.,
Gloeckler George
Publication year - 2002
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 - 10.1029/2001gl013449
Subject(s) - solar wind , physics , earth's magnetic field , bow shock (aerodynamics) , magnetosphere , ion , geomagnetic storm , geophysics , ring current , population , bow wave , shock wave , atmospheric sciences , atomic physics , computational physics , plasma , magnetic field , nuclear physics , mechanics , sociology , demography , quantum mechanics
We present the first study of Low‐Charge‐State Heavy Ion (LCSHI) events covering a region from Earth's bow shock to the L1 point, obtained with the Suprathermal Ion Composition Spectrometer onboard Wind. STICS is capable of distinguishing charge states of suprathermal ions. In 1995–2000 we found a large number of particle events revealing species of magnetospheric origin. LCSHI events tend to occur in series and in connection with geomagnetic activity. The occurrence rate is found to increase towards solar maximum. The spatial region covered by this particle population ranges from the bow shock to beyond distances of 130 R e , where one of the strongest events occurred. Based on the characterization of LCSHI events we discuss mechanisms for their formation. We conclude that the most probable sources of these ion events are substorms in association with Alfvén waves in high‐speed solar wind streams and the magnetic storm recovery ring current.