Ionospheric Response to the Recurrent Geomagnetic Activity of April 02: Total Electron Content and GPS/UHF Scintillation Variations From the Magnetic Pole to the Equator

Details Ionospheric Response to the Recurrent Geomagnetic Activity of April 02: Total Electron Content and GPS/UHF Scintillation Variations From the Magnetic Pole to the Equator Ionospheric Response to the Recurrent Geomagnetic Activity of April 02: Total Electron Content and GPS/UHF Scintillation Variations From the Magnetic Pole to the Equator

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa21b0454b&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA21B-0454

Physics

2134 Interplanetary Magnetic Fields, 2435 Ionospheric Disturbances, 2439 Ionospheric Irregularities, 2778 Ring Current, 2788 Storms And Substorms

Scientific paper

We report the study of a rather unusual response of the ionosphere to the recurrent magnetic activity of April 17-21, 2002. The study has been based on UHF scintillation observations at AFRL scintillation sites dispersed from the pole to the equator and GPS measurements of the total electron content (TEC) of the ionosphere and their fluctuations at widely dispersed stations of the International Geodynamic Service (IGS). The scintillation, TEC and TEC fluctuation dataset are being examined in the context of the observations of the GUVI sensor on the TIMED satellite and satellite in situ measurements by the DMSP satellites and the low inclination ROCSAT-1 satellite. During this period of recurrent magnetic activity, strong UHF scintillation associated with polar cap patches was recorded at Thule, Greenland. The patch activity occurred during IMF Bz southward orientation that favored magnetic reconnection and the formation of patches. The DMSP satellites showed that an expanded auroral oval was sustained throughout this storm period. The nighttime trough was consistently located at magnetic latitudes near 55 degrees. This explained the occurrence of recurrent nighttime scintillation events and GPS TEC fluctuations at the sub-auroral location of Hanscom AFB. During this magnetically active period, equatorial scintillation at UHF was detected over limited longitudes that commenced near midnight and continued till the pre-noon period in the presence of E-region conductivity. It is interesting to note that not only was the generation of irregularities longitudinally confined, but the irregularities were also quenched due to their fast decay across a sharp longitude boundary. The storm-time penetration of high latitude electric field to the equatorial region over a limited longitude region is currently being intensively investigated. The DMSP satellites also detected electron density irregularities over a limited longitude interval. The ROCSAT-1 satellite observations are being examined to determine the characteristics of the zonal electric field over the equatorial region.

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