Physics
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10911302p&link_type=abstract
Journal of Geophysical Research, Volume 109, Issue A11, CiteID A11302
Physics
12
Ionosphere: Ionospheric Dynamics, Ionosphere: Current Systems (2708), Ionosphere: Ionosphere/Atmosphere Interactions (0335), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Numerical Modeling
Scientific paper
We investigate the role of the solar wind dynamic pressure on the ionospheric dynamics both observationally and using a global MHD simulation. Using ACE solar wind observations we carry out a statistical superposed epoch analysis, in which we determine the ionospheric response, as characterized by the AE index, to solar wind pressure pulses identified from the ACE solar wind data. We find that under steady southward interplanetary magnetic field the AE index increases 35% in 20 min following the pressure pulse but that no such reaction is observed under steady northward IMF. Second, we determine the ionospheric Joule heating in several events using a global MHD simulation GUMICS-4. We find that the solar wind dynamic pressure and the Joule heating are positively correlated. Finally, we discuss mechanisms linking the dynamic pressure to Joule heating. We find evidence that in the simulation, increasing dynamic pressure increases field-aligned currents, which then increases ionospheric Joule heating.
Janhunen Pekka
Koskinen Hannu E. J.
McComas David John
Palmroth M. M.
Pulkkinen Tuija I.
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