Global Signatures of the Traveling Convection Vortex on November 9, 1993

Details Global Signatures of the Traveling Convection Vortex on November 9, 1993 Global Signatures of the Traveling Convection Vortex on November 9, 1993

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm41b0822s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM41B-0822

Physics

2154 Planetary Bow Shocks, 2431 Ionosphere/Magnetosphere Interactions (2736), 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Zesta et al. [JGR, 28041, 1999] presented a detailed case study of traveling convection vortices (TCVs) observed at pre-noon local times over North America from 1700 to 1800 UT on November 9, 1993. They suggested that the corresponding solar wind pressure pulses were generated in the foreshock and noted that no TCVs were seen at post-noon local times. We have assembled simultaneous solar wind, geosynchronous, mid-latitude, and equatorial ground magnetograms for these events. We use IMP-8 plasma, magnetic field, and energetic ion observations to confirm that the dynamic pressure variations generating these events have the characteristics of diamagnetic cavities and were generated within the foreshock. According to the IMP-8 observations, the features should have encountered the entire post-noon magnetosphere nearly simultaneously, and then swept past the pre-noon magnetopause. Consequently the azimuthal pressure gradients required to generate intermediate mode waves, field-aligned currents, and TCVs were only present in the pre-noon magnetosphere. Nevertheless, fast mode waves generated corresponding SI signatures in all dayside equatorial and mid-latitude ground magnetograms. We use high time resolution ground magnetograms to show that these signatures originated at equatorial latitudes near dusk, consistent with expectations for the observed IMF orientation, but in contrast to past reports of signatures spreading equatorward from the auroral oval.

Affiliated with

Also associated with

No associations

Rating

Global Signatures of the Traveling Convection Vortex on November 9, 1993 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 Global Signatures of the Traveling Convection Vortex on November 9, 1993, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Global Signatures of the Traveling Convection Vortex on November 9, 1993 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1385115