Low-Charge-State Heavy Ions far Upstream the Earth's Bow Shock: Wind Observations of Suprathermal Plasma of Magnetospheric Origin in the Solar Wind and its Association with Geomagnetic Storms

Details Low-Charge-State Heavy Ions far Upstream the Earth's Bow Shock: Wind Observations of Suprathermal Plasma of Magnetospheric Origin in the Solar Wind and its Association with Geomagnetic Storms Low-Charge-State Heavy Ions far Upstream the Earth's Bow Shock: Wind Observations of Suprathermal Plasma of Magnetospheric Origin in the Solar Wind and its Association with Geomagnetic Storms

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm41a04p&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM41A-04

Physics

2116 Energetic Particles, Planetary, 2154 Planetary Bow Shocks, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms

Scientific paper

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 on the Wind spacecraft. STICS is capable of distinguishing charge states of suprathermal heavy ions. In 1995-2000 we found a large number of upstream events revealing species of magnetospheric origin. Series of these events tend to occur after moderate to strong geomagnetic activity. The tie to geomagnetic disturbances is expressed in the fact that the occurence rate is much higher near solar maximum compared to periods near solar minimum. One characteristic of LCSHI upstream events is the large spatial region where these can be found: from the vicinity of the bow shock up to a distance of 150 Re, where one of the strongest events occured. Here we focus on characterizing these LCSHI events and we present possible mechanisms for their formation.

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