Extreme Equatorial and Low-Latitude Electric Fields and Thermospheric Winds During a Superstorm

Details Extreme Equatorial and Low-Latitude Electric Fields and Thermospheric Winds During a Superstorm Extreme Equatorial and Low-Latitude Electric Fields and Thermospheric Winds During a Superstorm

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa23a..08k&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SA23A-08

Other

2415 Equatorial Ionosphere, 3369 Thermospheric Dynamics (0358), 3384 Acoustic-Gravity Waves

Scientific paper

Incoherent scatter radar data were obtained at all of the incoherent scatter radar stations in the NSF/Peruvian chain during part of the November 2004 Superstorm. In addition the storm caught the attention of many modeling groups. The electric field pattern at Millstone Hill (L=3.2) was typical for observations in the auroral oval on November 10. At lower latitudes, extreme penetrating electric fields (PPE) and disturbance dynamo (DD) effects were observed. Both of these field types yielded vertical plasma drifts at the magnetic equator that were higher than 100 m/s, the largest ever recorded for this drift component. The PPE event tracked the interplanetary electric field (IEFy) component for 10 hours from dawn to dusk with a factor of 10% for a positive IEFy and about 3% for the opposite sign. The equatorial field then departed from the IEF and reversed sign, indicating a huge disturbance dynamo. Three bursts of high winds with downward-phase progression were observed over Arecibo in agreement with dynamo action. The prereversal enhancement was suppressed during a period of northward interplanetary magnetic field (negative IEFy) but when the latter changed sign, the equatorial F layer rose to heights near 1000 km and a convective ionospheric storm (aka ESF) began. When the disturbance dynamo developed, the CIS was quenched. These results will be compared to TIMEGCM and to assimilative models at AFRL as well as to other sources of ionospheric data.

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