Height-integrated Pedersen conductivity in both E and F regions from COSMIC observations

Abstract
<p>Altitudinal distribution of Joule heating is very important to the thermosphere and ionosphere, which is roughly proportional to the Pedersen conductance at high latitudes. Based on the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) satellites observations from 2008 to 2011, the height-integrated Pedersen conductivities in both E (100\textendash150\&nbsp;km) and F (150\textendash600\&nbsp;km) regions and their ratio <sub>γ</sub><sub>P</sub>γP (<sub>∑</sub><sub>PE</sub>/<sub>∑</sub><sub>PF</sub>∑PE/∑PF) have been calculated. The result shows that the maximum ratio in the northern summer hemisphere is ~5.5, which is smaller than that from the Thermosphere\textendashIonosphere\textendashElectrodynamics General Circulation Model (TIE-GCM v1.94) simulation (~9). This indicates that the energy inputs into the F region may be underestimated in the model. The seasonal variations of the ratio have been investigated for both hemispheres, and an interhemispheric asymmetry has been identified. The variational trend of the ratio is similar in both hemispheres, which reaches minimum at local summer and maximum at local winter. However, the difference of the ratio from local summer to local winter in the southern hemisphere is larger than that in the northern hemisphere.</p>
Year of Publication
2014
Journal
Journal of Atmospheric and Solar-Terrestrial Physics
Volume
115-116
Number of Pages
79-86
Date Published
08/2014
ISSN Number
13646826
URL
http://www.sciencedirect.com/science/article/pii/S1364682613003313
DOI
10.1016/j.jastp.2013.12.013