Observations of a positive storm phase on September 10, 2005

L. P. Goncharenko, J. C. Foster, A. J. Coster, C. Huang, N. Aponte, L. J. Paxton

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish
Pages (from-to)1253-1272
Number of pages20
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Volume69
Issue number10-11 SPEC. ISS.
DOIs
Publication statusPublished - Jul 1 2007

Fingerprint

tropical regions
electron density
F region
daytime
ionospheric storms
traveling ionospheric disturbances
incoherent scatter radar
magnetic storms
ion temperature
geomagnetic storm
penetration
electron energy
electric field
ionization
GPS
temperature
electric fields
radar
augmentation
electron

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science

Cite this

Goncharenko, L. P., Foster, J. C., Coster, A. J., Huang, C., Aponte, N., & Paxton, L. J. (2007). Observations of a positive storm phase on September 10, 2005. Journal of Atmospheric and Solar-Terrestrial Physics, 69(10-11 SPEC. ISS.), 1253-1272. https://doi.org/10.1016/j.jastp.2006.09.011

Observations of a positive storm phase on September 10, 2005. / Goncharenko, L. P.; Foster, J. C.; Coster, A. J.; Huang, C.; Aponte, N.; Paxton, L. J.

In: Journal of Atmospheric and Solar-Terrestrial Physics, Vol. 69, No. 10-11 SPEC. ISS., 01.07.2007, p. 1253-1272.

Research output: Contribution to journalArticle

Goncharenko, LP, Foster, JC, Coster, AJ, Huang, C, Aponte, N & Paxton, LJ 2007, 'Observations of a positive storm phase on September 10, 2005', Journal of Atmospheric and Solar-Terrestrial Physics, vol. 69, no. 10-11 SPEC. ISS., pp. 1253-1272. https://doi.org/10.1016/j.jastp.2006.09.011
Goncharenko LP, Foster JC, Coster AJ, Huang C, Aponte N, Paxton LJ. Observations of a positive storm phase on September 10, 2005. Journal of Atmospheric and Solar-Terrestrial Physics. 2007 Jul 1;69(10-11 SPEC. ISS.):1253-1272. https://doi.org/10.1016/j.jastp.2006.09.011
Goncharenko, L. P. ; Foster, J. C. ; Coster, A. J. ; Huang, C. ; Aponte, N. ; Paxton, L. J. / Observations of a positive storm phase on September 10, 2005. In: Journal of Atmospheric and Solar-Terrestrial Physics. 2007 ; Vol. 69, No. 10-11 SPEC. ISS. pp. 1253-1272.
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