Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jastp..65.1099v&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 65, Issue 10, p. 1099-1105.
Physics
3
Ionosphere-Plasmasphere Coupling, Ionospheric Modeling, Midlatitude Plasma Flux, Magnetic Storm, F2 Region
Scientific paper
An analytical-numerical model is created for two nights during Space Weather Month in September 1999. On one of these nights, after the midnight collapse over the Arecibo Observatory, the plasma density remained quite high in spite of a very sharp decrease in the F2 peak height. In order to support this high density against recombination, a very high plasma flux from the plasmasphere, a value of about 6×108cm-2s-1, is needed. Initially, data assimilation attempts did not allow such a flux (see Ionospheric data assimilation: recovery of strong mid-latitudinal density gradients, J. Atmos. Sol.-Terr. Phys., this issue). We believe the high flux results from a well-developed equatorial fountain and an Appleton anomaly well north of its usual location. The latter is consistent with both the large plasma gradient over Arecibo and the enhanced Jicamarca electric field (see Midlatitude plasma and electric field measurements during Space Weather Month, September 1999. J. Atmos. Sol.-Terr. Phys., this issue).
Kelley Michael C.
Makela Jonathan J.
Nicolls Michael J.
Vlasov Michael N.
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