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GEOPHYSICAL RESEARCH LETTERS,
VOL. 26, NO. 15,
PAGES 2339–2342,
1999
Ionospheric Mass Ejection in Response to a CME
T. E. Moore
NASA GSFC, Greenbelt, MD, USA.
W. K. Peterson
LMATC, Palo Alto, CA, USA.
C. T. Russell
ESS, U. of CA, Los Angeles, CA, USA
M. O. Chandler
NASA MSFC, Huntsville, AL, USA.
M. R. Collier
NASA GSFC, Greenbelt, MD, USA.
H. L. Collin
LMATC, Palo Alto, CA, USA.
P. D. Craven
NASA MSFC, Huntsville, AL, USA.
R. Fitzenreiter
NASA GSFC, Greenbelt, MD, USA.
B. L. Giles
NASA GSFC, Greenbelt, MD, USA.
C. J. Pollock
SwRI, San Antonio, TX, USA.
Abstract
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.
Received 17
January
1999;
accepted 14
May
1999.
Read Full Article Cited by
Citation: Moore, T. E., W. K. Peterson, C. T. Russell, M. O. Chandler, M. R. Collier, H. L. Collin, P. D. Craven, R. Fitzenreiter, B. L. Giles, and C. J. Pollock
(1999),
Ionospheric Mass Ejection in Response to a CME,
Geophys. Res. Lett.,
26(15),
2339–2342.
Copyright 1999 by the American Geophysical Union.
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