Ionospheric mass ejection in response to a CME

Details Ionospheric mass ejection in response to a CME Ionospheric mass ejection in response to a CME

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2339m&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 15, p. 2339-2342

Astronomy and Astrophysics

Astrophysics

68

Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Ionosphere: Ionosphere/Magnetosphere Interactions

Scientific paper

We report observations of a direct ionospheric plasma outflow response to the incidence of an interplanetary shock and associated coronal mass ejection (CME) upon the earth's magnetosphere. Data from the WIND spacecraft, 185 RE upstream, document the passage of an interplanetary shock at 23:20 UT on 24 Sept. 1998. The polar cap plasma environment sampled by the POLAR spacecraft changed abruptly at 23:45 UT, reflecting the compressional displacement of the geopause relative to the spacecraft. POLAR left the polar wind outflow region and entered the mantle flows. Descending toward the dayside cusp region, POLAR later returned from the mantle to an enhanced polar wind flux dominated by O+ plasma and eventually containing molecular ions. The enhanced and O+-dominated outflow continued as the spacecraft passed through the high altitude cleft and then the southern cleft at lower altitude. Such a direct response of the ionosphere to solar wind dynamic pressure disturbances may have important impacts on magnetospheric dynamics.

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