Physics
Scientific paper
Mar 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jastp..72..358m&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 72, Issue 4, p. 358-368.
Physics
2
Ionospheric Variability, General Circulation Modeling, Coupling Of Atmospheric Regions, Equatorial Aeronomy, Low-Latitude Ionosphere
Scientific paper
The thermosphere-ionosphere-mesosphere-electrodynamics coupled model TIME-GCM, coupled to NCEP lower atmosphere data, is used to simulate the noontime ionospheric peak electron density NmF2 at low latitudes for year 2002. Model output are compared with observations a three ionosonde stations: Jicamarca, Ascension Island and Darwin, stations at geomagnetic latitudes of 3°S, 10°S and 22°S, respectively. The modeled electron density at the peak of the F2-layer (NmF2) matches the general trend of the data fairly well at noon throughout the year. The shapes of the diurnal curves of NmF2 vs. local time are not well produced in the model, and particularly so at the two stations away from the geomagnetic equator. At all sites the day-to-day variability of NmF2, assessed using the percent standard deviation about the monthly mean, is about twice the modeled variability. Possible sources of this shortfall in the model may be due to the under-representation of coupling from below and/or from auroral sources.
Mendillo Michael
Rishbeth Henry
Roble Raymond
Wroten Joei
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