C/NOFS Observations of Plasma Density and Electric Field Responses to High Speed Streams in the Solar Wind

Details C/NOFS Observations of Plasma Density and Electric Field Responses to High Speed Streams in the Solar Wind C/NOFS Observations of Plasma Density and Electric Field Responses to High Speed Streams in the Solar Wind

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa33a1434g&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA33A-1434

Physics

[2415] Ionosphere / Equatorial Ionosphere, [2437] Ionosphere / Ionospheric Dynamics, [2439] Ionosphere / Ionospheric Irregularities

Scientific paper

C/NOFS plasma density and electric field measurements for 10 - 20 June 2008 indicate significant changes in geomagnetic conditions as a high speed stream (HSS) in the solar wind passed Earth. During the HSS passage C/NOFS encountered moderate to strong post-midnight equatorial plasma bubble (EPB) activity. As the corotating interaction region (CIR) at the leading edge of the HSS passed, the interplanetary magnetic field intensified and rotated, and the Bz component turned southward. C/NOFS observed a rapid transition to a strongly disturbed equatorial ionosphere that lasted for several hours. Eastward polarization electric fields intensified within locally depleted flux tubes, and SCINDA stations observed scintillation activity. Similar conditions were observed in mid March and early April 2009 as the coronal hole source regions for the HSSs returned to geoeffective positions with solar rotation. We compare these observations with events on 20-25 July 2009 when the northern hemisphere coronal hole source region was polar-connected. We then discuss relative contributions of gravity-driven currents, overshielding electric fields and disturbance dynamos as drivers of post-midnight depletions.

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