Low-charge-state heavy ions upstream of Earth's bow shock and sunward flux of ionospheric O+1, N+1, and O+2 ions: Geotail observations

Details Low-charge-state heavy ions upstream of Earth's bow shock and sunward flux of ionospheric O+1, N+1, and O+2 ions: Geotail observations Low-charge-state heavy ions upstream of Earth's bow shock and sunward flux of ionospheric O+1, N+1, and O+2 ions: Geotail observations

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2433c&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 16, p. 2433-2436

Physics

14

Interplanetary Physics: Energetic Particles, Planetary, Interplanetary Physics: Planetary Bow Shocks, Ionosphere: Ionosphere/Magnetosphere Interactions, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

Energetic ~10-210 keV/e low-charge-state heavy ions (LCSHI) were measured sunward of Earth's bow shock (to X~30RE) during numerous intervals lasting from minutes to hours using Geotail/STICS in 1995-1998. LCSHI fluxes are strong and continuous in a few tens of intervals, during which a strong component of ionospheric origin O+1, N+1, and O+2 streams sunward on nearly radial IMF. Most often though only `trace' levels are present. LCSHI flux is typically, but not exclusively, observed during diffuse upstream ion events. LCSHI are accompanied by sunward energetic electron bursts in three of the four cases shown and twice by enhanced IMF fluctuations. As O+1 streams sunward in the spacecraft frame during the strongest case, H+, He+2, He+1, and O+6 fluxes have weak anisotropies and the H+ energy spectrum is kappa-like. The strongest LCSHI fluxes tend to occur duskward of local noon during disturbed geomagnetic conditions. On average, LCSHI flux is more uniformly distributed across the dayside.

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