Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa13c..02b&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA13C-02
Physics
[2411] Ionosphere / Electric Fields, [2415] Ionosphere / Equatorial Ionosphere, [2439] Ionosphere / Ionospheric Irregularities, [2788] Magnetospheric Physics / Magnetic Storms And Substorms
Scientific paper
Plasma bubbles and scintillations were observed at the appropriate longitudes, namely in the Atlantic-sector, during the initial main phase (Basu et al., Radio Science, 2010) of complex CME-driven moderate magnetic storms that had a minimum Dst of - 60 nT at approximately 2300 UT on 3 August 2010. Fortunately, the C/NOFS satellite was near-perigee in this longitude sector during dusk and was able to intercept what was almost certainly the same bubble in two consecutive orbits. This allowed us to utilize the high resolution dc and ac electric fields from VEFI and plasma density measurements from PLP to track the evolution of the electric field and plasma density structure for the first time to elucidate the variability in the spectral characteristics in a freshly generated and mature bubble. In addition to the two-sloped density structure observed by Rodrigues et al. ( GRL, 2009), the most significant finding was the persistence of the electric field structuring at high frequencies observed in both dc and ac measurements. Such high frequency structures and their dynamics have great significance for the interpretation of radar measurements (Hysell et al., GRL, 2009) and for testing the predictions of instability theories at meter and sub-meter scale irregularities (Huba and Ossakow, JGR, 1979). The scintillation measurements at the Atlantic SCINDA sites, namely, Cape Verde closer to the magnetic equator in the Northern Hemisphere and Ascension Island near the southern crest of the equatorial anomaly shed light on the belt width of scintillations during a moderate magnetic storm in a period where climatologically scintillations are almost non-existent.
Basu Sarbani
Costa Edgar
Pfaff Robert F.
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