Physics
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jastp..61..249m&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 61, Issue 3-4, p. 249-261.
Physics
23
Scientific paper
An observed daytime negative storm effect on 10 January and strongpost-midnight Nm F2 increases on 7 and 8 January followed by a steep Te decrease down to Tn are analyzed. Daytime neutral composition and Tn(h) were inferred from incoherent scatter (IS) radar observations using aself-consistent approach to F2 -layer modelling. Observed daytime Te , Ti , Ne profiles were corrected for the disturbed day using the calculated ioncomposition. The main reason for the observed Nm F2 negative storm effectis the O/(N2 O2 ) ratio decrease in the thermosphere. The calculated O/N2 ratio at hm F2 is less by a factor of 3.7 than MSIS prediction for 10January and is close to MSIS for quiet days. Strong Nm F2 night-time increase by afactor of 3 is due to a plasma compression mechanism under the action of observed EB drift(westward E-field) moving plasma from higher L shells to lower ones and squeezing it into the F2 -region. Moderate (1-2)10 8 cm -2 s -1 O fluxes in agreement with IS observations were shown to be sufficient to account for the night-timeNm F2 increase. This elevation in the F2 -region electron densityis shown to be the main reason for the observed steep Te post-midnight decrease. 1999 ElsevierScience Ltd.
Forster Manuel
Mikhailov Alexander. V.
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