Observations of a positive storm phase on September 10, 2005

Details Observations of a positive storm phase on September 10, 2005 Observations of a positive storm phase on September 10, 2005

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jastp..69.1253g&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 69, Issue 10-11, p. 1253-1272.

Physics

11

Scientific paper

In this study, we present multi-instrument observations of a strong positive phase of ionospheric storm, which occurred on September 10, 2005 during a moderate geomagnetic storm with minimum Dst=-60 nT and maximum Kp=6 . The daytime electron density measured by the Millstone Hill incoherent scatter radar (42.6°N, 288.5°E) increased after 13 UT (˜8 LT) compared with that before the storm. This increase is observed throughout the daytime, lasts for about 9 h, and covers F-region altitudes above ˜230 km. At the altitude of 300 km, the maximum increase in Ne reaches a factor of 3 by 19:30 20:00 UT and is accompanied by a ˜1000 K decrease in electron temperature, a ˜100 150 K increase in ion temperature, and a strong upward drift. Observations by Arecibo ISR (18.3°N, 293.3°E) reveal similar features, with the maximum increase in electron density reaching a factor of 2.5 at 21:30 UT, i.e. 1.5 2 h later than over Millstone Hill. The GPS TEC data show that the increase in electron density observed at Millstone Hill and Arecibo is only a part of a global picture reflected in TEC. The increase in TEC reaches a factor of 2 and covers middle and low latitudes at 19 UT. At later times this increase moves to lower latitudes. A combination of mechanisms were involved in generation of positive phase. The penetration electric field resulted in Ne enhancements at subauroral and middle latitudes, the TAD/TID played an important role at middle and lower latitudes, and increase in O/N2 ratio could contribute to the observed positive phase at middle and lower latitudes. The results show the importance of an upward vertical drift at ˜140 250 km altitude, which is observed for sustained period of time and assists in the convergence of ionization into the F-region.

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