Specification of Equatorial Ionospheric Irregularities at Dusk During the Main Phase of Large Magnetic Storms Over Solar Cycle 23

Details Specification of Equatorial Ionospheric Irregularities at Dusk During the Main Phase of Large Magnetic Storms Over Solar Cycle 23 Specification of Equatorial Ionospheric Irregularities at Dusk During the Main Phase of Large Magnetic Storms Over Solar Cycle 23

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa43a..08b&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SA43A-08

Physics

2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

The paper presents a statistical study of the formation of electron density irregularities in the equatorial ionosphere at dusk during the main phase of 36 large magnetic storms (Dst <100 nT) occurring within Solar Cycle 23. We have tracked globally the formation of equatorial irregularities of electron density by the use of scintillation observations made by the SCINDA network and DMSP satellite in-situ measurements of plasma bubbles. Prompt penetration electric fields occur in the main phase of large storms and the electric field is oriented eastward during daytime through dusk and westward during the night. The study reveals that VHF/UHF scintillations and plasma bubbles are located at a specific longitude sector for which the early evening period (1940 LT - 2020 LT) corresponds to the time interval between rapid Dst variation of -50 nT/hr and the minimum Dst. The eastward penetration electric field acting on the east-west conductivity gradient at dusk presumably sets off the plasma instability to cause bubbles and scintillations. Based on the results of this study, the scintillation specification algorithm within SCINDA is being updated to reflect the longitude of ionospheric disturbances at dusk during magnetic storms.

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