Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3624103o&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 24, CiteID L24103
Physics
3
Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Ionosphere: Auroral Ionosphere (2704), Ionosphere: Particle Acceleration
Scientific paper
We present quantitative radar observations of both hydrogen ion (H+) and oxygen ion (O+) upflow in the topside polar ionosphere using measurements that were recently carried out with the EISCAT Svalbard Radar and the Reimei satellite. H+ upflow was clearly observed equatorward of the cusp above 500 km altitude. Within the cusp the H+ density was very low, and the upflow was dominated by O+ ions, but on closed field lines the H+ became the larger contributor to the upward flux above about 550 km. The total flux seemed to be conserved, and so below 550 km altitude O+ (with a small upward velocity of ˜50 m s-1) appeared to determine the upward flux which was then maintained by H+ in the topside ionosphere. We also found that the H+ density in the topside polar ionosphere was several times higher than current predictions of ionospheric models like IRI2001.
Aso Takehiko
Buchert Stephan C.
Fujii Ryoichi
Haggstrom Ingemar
Hirahara Masafumi
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