Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa62a04k&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA62A-04
Physics
0355 Thermosphere--Composition And Chemistry, 2162 Solar Cycle Variations (7536)
Scientific paper
Orbital drag parameters from the comprehensive catalog of orbiting objects maintained by Naval Space Command are capable of providing synoptic information on the medium and long term behavior of thermospheric density. For objects that are not actively controlled, a simple relationship may be derived between the mean orbital drag and the mean atmospheric density over the orbit determination period. After estimating the ballistic coefficient from long term observations, the thermospheric density may then be extracted. These data provide a new tool for analysis of thermospheric density that provides some unique advantages, together with some shortcomings. The data are long-term, relatively homogeneous and are sampled simultaneously at a number of altitudes. Thus they can provide information on the altitude behavior of atmospheric density as well as mean density. This type of data cannot provide information about short-term fluctuations, or geographical variations, because it is low pass filtered by the orbit determination process; for the present data base the filter period is 3 days. We have used orbital element sets for 120 low earth orbit objects selected from the catalog for the period 1995-2001 to monitor thermospheric density from solar minimum to solar maximum. The dramatic change in density during this interval is clearly exhibited, and Fourier analysis shows the prominent effect of the solar rotation period. The density for each space object in the sample will be compared to the thermospheric models NRLMSISE-00, MSIS-90E, and Jacchia 70. This analysis is part of a comprehensive program to improve nowcasting and forecasting for positions of resident space objects. The objects chosen are those used in the Space Warfare Center/Space Battlelab High Accuracy Satellite Drag Model initiative for dynamic atmospheric calibration. This work will be supplemented by shorter fitspan orbit determinations from current observations. In addition, this work will serve as a calibration for the new method of determining thermospheric density from ultraviolet spectra that is scheduled to become operational with the upcoming launch of the SSULI sensor of the next DMSP payload
Dymond Kenneth
Healy Liam
Knowles Stephen H.
Nicholas A.
Picone Michael
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