AbstractDensities derived from accelerometer measurements on the CHAMP satellite near 400km are used to statistically establish characteristics of large-scale (>1000km) traveling atmospheric disturbances (TADs). Only TADs that at least propagate from the auroral zone to the equator are analyzed here, and a total of 21 identifiable events are found over the years 2001–2007. The average speed of all TADs, regardless of local time, is 646±122ms−1. The average speeds on the dayside and nightside are 595±127ms−1 and 685±106ms−1, respectively, i.e., the speed appears to be 10% higher on average on the nightside. On six occasions TADs were only detected on the night side; however, TADs on the dayside often appear more distinctly in the data. Moreover, contrary to some theoretical expectations, dayside TADs do not dissipate more readily than night side TADs, although much less are detected between 8–20 solar local time. No clear dependence of TAD amplitude or phase speed with respect to Kp, or rate of increase of Kp, is found.
Properties of traveling atmospheric disturbances (TADs) inferred from CHAMP accelerometer observations
Advances in Space Research ; 43 , 3 ; 369-376
2008-10-29
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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