Details

Autor(en) / Beteiligte

• Moore, T. E.
• Peterson, W. K.
• Russell, C. T.
• Chandler, M. O.
• Collier, M. R.
• Collin, H. L.
• Craven, P. D.
• Fitzenreiter, R.
• Giles, B. L.
• Pollock, C. J.

Titel

Ionospheric mass ejection in response to a CME

Ist Teil von

• Geophysical research letters, 1999-08, Vol.26 (15), p.2339-2342

Ort / Verlag

Washington, DC: Blackwell Publishing Ltd

Erscheinungsjahr

1999

Link zum Volltext

Quelle

Wiley Online Library

Beschreibungen/Notizen

• 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.