Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm43a1154f&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM43A-1154
Other
2111 Ejecta, Driver Gases, And Magnetic Clouds, 2435 Ionospheric Disturbances, 2778 Ring Current, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
When ejecta interact with each other en route to Earth, their parameters are changed in significant ways, and with it their
geoeffectiveness. Among the effects of such interactions are: heating of the plasma, acceleration of the leading ejecta and deceleration of the trailing ejecta, compressed field and plasma in the leading ejecta, disappearance of shocks originally driven by the trailing ejecta, and the strengthening of shocks driven by the accelerated ejecta. Here we model the ring current enhancement and radiation belt behavior and try to isolate the effects these changes had on the magnetosphere when 2 ejecta in the process of coalescing reached Earth on March 31, 2001. The magnetosphere senses the presence of the two ejecta and reacts with a re-activation of the ring current soon after it started to recover from the first ejection, giving rise to a double-dip great storm (Dst < -250 nT). The compression of the plasma in the leading ejecta by itself gives a contribution of > 100 nT to the Dst corrected for magnetopause currents. This is about three times that due (i) to the compression behind the shock and (ii) the compression in the trailing ejecta. The high, but monotonically decreasing, plasma sheet density is probably also a result of the compression of the plasma in the leading ejecta. The non-linear behavior of the magnetosphere is illustrated with the behavior of the cross-polar cap potential, as calculated using the AMIE technique. Acknowledgements. This work is supported by the Wind Grant NAG5-11803 and by NASA Living with a Star Grants NAG5-10883, NAG5-13512, NASW/02035, and NSF Space Weather grants ATM-0208414 and NATM-0309585.
Berdichevsky Daniel B.
Farrugia Charles J.
Jordanova Vania K.
Lu Gang
Thomsen Michelle F.
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