COSMIC observations of dayside TEC enhancements in response to a moderate disturbance in the solar wind

Details COSMIC observations of dayside TEC enhancements in response to a moderate disturbance in the solar wind COSMIC observations of dayside TEC enhancements in response to a moderate disturbance in the solar wind

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa43b1759l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA43B-1759

Physics

[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2443] Ionosphere / Midlatitude Ionosphere, [7974] Space Weather / Solar Effects

Scientific paper

We have analyzed COSMIC satellite measurements acquired during five days in November 2007 to study Total Electron Content (TEC) responses of dayside ionosphere to the passage of a high-speed stream (HSS) in the solar wind by Earth. The corotating interaction region (CIR) at the leading edge of the HSS reached Earth at approximately the same time as an interplanetary coronal mass ejection (ICME). Near the first Lagrange point the event was marked by a sharp increase in plasma density, followed by an intensification and rotation of the interplanetary magnetic field (IMF), inducing a moderate magnetic storm with minimum Dst = -71 nT. TEC enhancements appeared at mid- to high-magnetic latitudes during the CIR/ICME driven main phase. Some increases exceeded quiet-time values by factors of ~110%. With no auroral electron precipitation to create new plasma in the magnetic-latitude range where COSMIC detected TEC increases the enhancements must reflect transport effects. Neutral winds generated at auroral latitudes should push dayside plasma equatorward, contrary to COSMIC observations. Rather, the required transport implies plasma drifts from low to higher latitudes, due to the dawn-to-dusk penetration electric fields. ACE measurements allow estimates of penetration electric fields which we mapped to the ionosphere and calculated plasma transport velocities. We show that observed TEC dynamics can be understood as reflecting interplay between stormtime transport due to penetration electric fields and production/loss rates experienced by plasma parcels as they rotate around Earth.

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