Dynamics of American Sector Mid and Low Latitude Ionospheric and Thermospheric Response During the November 2004 Superstorm

Details Dynamics of American Sector Mid and Low Latitude Ionospheric and Thermospheric Response During the November 2004 Superstorm Dynamics of American Sector Mid and Low Latitude Ionospheric and Thermospheric Response During the November 2004 Superstorm

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa44a..06e&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA44A-06

Physics

2411 Electric Fields (2712), 2431 Ionosphere/Magnetosphere Interactions (2736), 2437 Ionospheric Dynamics, 2441 Ionospheric Storms (7949)

Scientific paper

Interplanetary electric field (IEF) penetration into the inner magnetosphere and plasmasphere can occur during intense geomagnetic storms, enhancing eastward electric fields over the sunlit ionosphere. Such events can serve as triggers for complex ionosphere-magnetosphere feedback mechanisms which increase ionospheric convection and neutral winds both locally and globally. We present a study of ionospheric dynamics and physical drivers during several events contained within the November 9 - 11, 2004 superstorm. This event was marked by excellent coverage from the full American sector incoherent scatter radar chain at Jicamarca, Arecibo, Millstone Hill, and Sondrestrom, which allows wide latitude diagnostics of E and F region electric fields, plasma densities and temperatures, and neutral wind vectors. We also employ CARISMA magnetometer chain observations, DMSP SSIES topside ion drifts, and GPS derived total electron content (TEC) maps to place the radar data in context. Penetrating eastward electric fields were seen from Millstone Hill equatorwards to Jicamarca for over 15 hours on November 9 and 10, accompanied by very low TEC values and a plasmasphere boundary layer midway between Millstone Hill and Arecibo. Equatorward neutral wind surges of ~ 300 m/s were driven locally by substorms at Millstone Hill and Arecibo, with associated dynamo effects creating prompt electric fields and large F layer downdrafts. Substorm timing during three separate events as identified from CARISMA magnetometers is consistent with Millstone Hill observed neutral wind surges. We also present results from TIMEGCM model runs and compare predictions of ionospheric conditions along the radar chain to gain insight into the complex physical drivers during this superstorm event.

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