Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa43c..08b&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA43C-08
Physics
[2415] Ionosphere / Equatorial Ionosphere, [2435] Ionosphere / Ionospheric Disturbances, [2439] Ionosphere / Ionospheric Irregularities, [2441] Ionosphere / Ionospheric Storms
Scientific paper
Scintillation measurements at 250 MHZ were performed starting September 2009 to the present at Cape Verde (dip latitude 11°N) and Ascension Island (dip latitude 15°S), both in the African longitude sector. The Cape Verde measurements are similar to the earlier established longitude variation for this sector based on scintillation observations at Ascension Island during solar cycle 23. This pattern consists of equinoctial maxima, a June solstice minimum and a reduced secondary maximum in the December solstice. However, the differing dip latitude of the two stations provided a very interesting asymmetry in the occurrence of scintillations, with a much larger occurrence observed at Cape Verde. It seems that during this low solar minimum period the pre-reversal upward drift is not large enough for the irregularity layer to embrace the Ascension Island location at 15°S. The recent magnetic storm on 3-4 August, 2010, provided a very large impact on VHF scintillations at both Cape Verde and Ascension Island. The storm effect was prominent because it occurred during a time of very low normal scintillation activity. The same storm was also studied from space using perigee orbits at dusk of the C/NOFS satellite which provided electron density perturbations over the African sector.
Basu Sarbani
Groves Keith M.
MacKenzie E.
Roddy Patrick A.
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