Specification of the Occurrence of Equatorial Ionospheric Scintillations During the Main Phase of the Early Magnetic Storms Within Solar Cycle 24

Details Specification of the Occurrence of Equatorial Ionospheric Scintillations During the Main Phase of the Early Magnetic Storms Within Solar Cycle 24 Specification of the Occurrence of Equatorial Ionospheric Scintillations During the Main Phase of the Early Magnetic Storms Within Solar Cycle 24

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa42a..08b&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA42A-08

Mathematics

Logic

[2415] Ionosphere / Equatorial Ionosphere, [2435] Ionosphere / Ionospheric Disturbances, [2439] Ionosphere / Ionospheric Irregularities

Scientific paper

Two moderate magnetic storms with their Dst minima on the order of -75nt were observed during the rising phase of solar cycle 24 in 2010. Earlier these authors had shown with a statistical study for solar cycle 23 that during large magnetic storms with Dst < -100nT and dDst/dt >50nt/hour, scintillations and plasma bubbles occur over a specific longitude sector for which the evening period corresponds to the time interval of the main phase of storms (S. Basu et al., Radio Science, 2010, in press). This was attributed to the penetration of the high latitude electric field to the magnetic equator which enhanced the rise in the F-region at dusk thereby generating the instability that give rise to plasma bubbles. This result overrides the climatological pattern of quiet-time variation of scintillation with longitude and season that shows an equinoctial maximum at all longitudes, a maximum in the December solstice over the African/American sector and a maximum in the June solstice over the Pacific sector. The scintillations observed for the magnetic storms during solar cycle 24 did not require a large rate of change of the Dst index leading to the implication that smaller electric field perturbations were sufficient to destabilize the ionosphere which has been cooled and contracted by the unusually long and quiet current sunspot phase. We will present two storms, one of which perturbs the SCINDA sites in the African/American sector and the other one which perturbs the Pacific sector sites, both at dusk. The outstanding addition to our study in this case is the availability of the perigee orbits of the in-situ C/NOFS data allowing the tracking of the plasma bubbles in space in the development of these storms.

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