Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm41b..03m&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM41B-03
Physics
2407 Auroral Ionosphere (2704), 2409 Current Systems (2708), 2431 Ionosphere/Magnetosphere Interactions (2736), 2437 Ionospheric Dynamics, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
We present the first direct observations of high-latitude ionospheric flows associated with the passage of a Sudden Impulse (SI) event. The SI event is caused by the passage of a solar wind discontinuity during which the solar wind pressure rapidly decreased from 8 to 2 nPa. This rapid reduction in solar wind pressure deforms the magnetopause, reconfiguring the outer magnetosphere and driving field-aligned currents that close in the high-latitude ionosphere. The new observations, obtained with the SuperDARN network of coherent backscatter radars and the Sondestrom incoherent radar, allow for the direct calculation of the strength and spatial extent of SI field-aligned currents. Ground-based magnetometer observations are also employed for a complete characterization of the transient field-aligned current system. Together, these measurements provide a unique opportunity to observationally and quantitatively relate the magnetospheric generation and the ionospheric closure of a magnetospheric current system. The results are also compared with global MHD simulations of the event and similar events to examine the nature of magnetosphere-ionosphere coupling processes during this class of events.
Holliday M. J.
Murr David Lee
Shepherd Simon G.
No associations
LandOfFree
Direct Measurement of Ionospheric Flows Associated with a Sudden Impulse Event does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Direct Measurement of Ionospheric Flows Associated with a Sudden Impulse Event, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct Measurement of Ionospheric Flows Associated with a Sudden Impulse Event will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1469201