Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa23b..06p&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA23B-06
Physics
0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition (3369), 2431 Ionosphere/Magnetosphere Interactions (2736), 2437 Ionospheric Dynamics
Scientific paper
UV remote sensing from low Earth orbit provides the opportunity to investigate the response of the coupled ionosphere/thermosphere system to magnetospheric inputs. Low Earth orbit (LEO) is particularly advantageous because a simple, low-cost, low-mass instrument such as GUVI can make limb and disk measurements that characterize the ionosphere and thermosphere. In this paper we will show the results of some of the comparisons we have carried out between the GITM model driven by typical AMIE inputs and when the UV data are included. The UV data are used to provide the hemispheric power due to particle precipitation based on the Zhang and Paxton [2007] model of the auroral energy distribution. The UV data are also used to provide global scale maps of the conductances. These real measurements show important departures from the conductance pattern inferred from AMIE. We also find that the model output can, indeed, be meaningfully challenged by the UV data. The UV data embodies information on the O. N2, O2 and electron density profiles on a global basis as well as the lower thermospheric O/N2 data. Note that the column O/N2 ratio observed by instruments like GUVI provides a unique insight into the thermospheric composition at about 135 km. We will discuss these differences for superstorms as well as moderate and quiet conditions because we find that there are significant differences between the models, climatologies such as MSIS and the data.
Christensen A.
DeMajistre Robert
Morrison Douglas
Paxton Larry J.
Ridley A. A.
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