Mathematics – Logic
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa24a..06r&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA24A-06
Mathematics
Logic
[7904] Space Weather / Geomagnetically Induced Currents, [7924] Space Weather / Forecasting, [7934] Space Weather / Impacts On Technological Systems, [7974] Space Weather / Solar Effects
Scientific paper
Correlating coronal hole observations from SoHO and STEREO with solar wind data from ACE and plasma density and electric field measurements from C/NOFS has allowed us to develop a new technique for scintillation activity alerts during solar minimum. As a high speed stream (HSS) in the solar wind passed Earth in June 2008, instruments on the C/NOFS satellite recorded post-midnight equatorial plasma bubbles (EPBs) and longitudinally broad depletions. Eastward polarization electric fields were consistently detected within locally depleted flux tubes. At the leading edge of the HSS the interplanetary magnetic field rapidly intensified and rotated causing auroral electrojet currents to rise and fall within a few hours. As the electrojet relaxed, C/NOFS recorded a rapid transition from a weakly to a strongly disturbed equatorial ionosphere that lasted ~10 hours. Similar effects were observed during passage of a HSS on 13-15 March 2009. Recurrence of midlatitude coronal holes, primary source regions for HSSs, with solar rotation facilitated advanced warnings of conditions conducive for scintillation activity during 7-9 April 2009.
Burke William J.
Crown M.
de La Beaujardiere Odile
Gentile Louise C.
Hunton Donald E.
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