TY - JOUR
T1 - Intense nighttime flux from the plasmasphere during a modest magnetic storm
AU - Vlasov, Michael N.
AU - Kelley, Michael C.
AU - Makela, Jonathan J.
AU - Nicolls, Michael J.
N1 - Funding Information:
Work at Cornell University was supported by the Atmospheric Sciences Section of the National Science Foundation under Grant ATM-0000196 and the Office of Naval Research Laboratory Grant N000014-01-1-0702. J.J.M. is supported in part by a National Science Foundation Graduate Research Fellowship. The Arecibo Observatory is part of the National Astronomy and Ionosphere Center, which is operated by Cornell University under a cooperative agreement with the National Science Foundation.
PY - 2003/7
Y1 - 2003/7
N2 - 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 × 108 cm-2 s-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).
AB - 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 × 108 cm-2 s-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).
KW - F region
KW - Ionosphere-plasmasphere coupling
KW - Ionospheric modeling
KW - Magnetic storm
KW - Midlatitude plasma flux
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U2 - 10.1016/j.jastp.2003.07.003
DO - 10.1016/j.jastp.2003.07.003
M3 - Article
AN - SCOPUS:0142120534
SN - 1364-6826
VL - 65
SP - 1099
EP - 1105
JO - Journal of Atmospheric and Solar-Terrestrial Physics
JF - Journal of Atmospheric and Solar-Terrestrial Physics
IS - 10
ER -