Abstract
In this paper, we present new multi-year and 72-day mean seasonal-latitudinal tidal structures in exospheric temperature derived from joint analysis of CHAMP and GRACE accelerometer measurements. These results include diurnal tides DE3, DE2, D0, and DW2 and semidiurnal tides S0, SE1, SE2, SE3, SW4, and SW6. We also employ Hough mode extensions (HMEs) and the Climatological Model of Thermosphere Tides (CTMT) to ascertain whether the observed structures are consistent with those observed at 110 km and presented in part 1 of this study. The aggregate sum of all the tidal components is shown to impose considerable longitude and month-to-month variability on the exosphere temperature tidal spectrum. Please see related article: http://www.earth-planets-space.com/content/66/1/136 .
Highlights
The degree to which the ionosphere-thermosphere (IT) system is linked to lower atmosphere variability is a fascinating discovery of the past decade or so
The bottom panel illustrates the four-interval vectormean temperature amplitudes for SABER, the middle panel illustrates the same quantities for exosphere temperature derived from CHAMP and GRACE, and the top panel illustrates the Climatological Model of Thermosphere Tides (CTMT) exosphere temperature results based on upward Hough mode extensions (HMEs) extensions from fits to TIMED/SABER and TIMED/TIDI climatologies below 120 km
There are some differences in details, the agreement in seasonal-latitudinal structures and amplitudes is sufficiently good to support the conclusion that the CHAMP-GRACE measurements reflect the vertical propagation of wave components entering the base of the thermosphere from the lower atmosphere
Summary
The degree to which the ionosphere-thermosphere (IT) system is linked to lower atmosphere variability is a fascinating discovery of the past decade or so. In part 1 of this two-part study, we revealed the seasonal-latitudinal dependences of the mean tidal spectrum entering the IT system at 110 km altitude This is the tidal spectrum that is likely driving electric fields of tidal origin in the dynamo region (100 to 150 km) of Earth’s ionosphere, and as such is highly relevant to the interpretation of F-region plasma drifts and the plasma redistributions that they produce. We provided new insights into the seasonal-latitudinal structures of components of the semidiurnal part of the spectrum that have received little or no attention in the literature, such as SE1, SE2, SE3, S0, SW4, and SW6 For all of these waves, one might ask to what degree they are capable of
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