Observations of downgoing velocity dispersed O+ and He+ in the cusp during magnetic storms

Details Observations of downgoing velocity dispersed O+ and He+ in the cusp during magnetic storms Observations of downgoing velocity dispersed O+ and He+ in the cusp during magnetic storms

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30rssc9m&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 18, pp. SSC 9-1, CiteID 1947, DOI 10.1029/2003GL017783

Physics

4

Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Ionosphere: Particle Precipitation, Ionosphere: Ionosphere/Magnetosphere Interactions (2736)

Scientific paper

Downgoing, velocity-dispersed (<1 keV to 25 keV) O+ and He+ ions accelerated at the magnetopause have been observed by the FAST satellite in the polar cusp. These ions, together with H+ ions, were observed during 24 magnetic storms. In comparison, only H+ was observed during >300 cusp crossings during low activity periods. During the largest storm, the O+ energy flux was an order of magnitude larger than the H+ energy flux. Velocity dispersed H+, with a signature of decreasing energy with increasing latitude during southward IMF, are normally observed in the low altitude cusp. These ions originate in the magnetosheath and, during dayside reconnection, are accelerated along the magnetopause with some ions funneled into the cusp. Poleward convection of the plasma leads to the latitude-velocity dispersion signature. Magnetospheric plasma can also be accelerated at the magnetopause, however the magnetosheath plasma density is much larger and magnetospheric composition is normally dominated by H+, so that distinguishing magnetospheric and magnetosheath plasma becomes difficult. During magnetic storms, auroral ionospheric outflow of O+ and He+ can be large enough to produce a significant, non-hydrogen component in the plasma sheet. These ions are convected through the inner magnetosphere and ring current, eventually appearing at the dayside magnetopause where they are accelerated and form this atypical cusp signature.

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