Globally averaged exospheric temperatures derived from CHAMP and GRACE accelerometer measurements

Impact of Solar Forcing on Thermospheric Densities and Spacecraft Orbits from CHAMP and GRACE

Alaskan Permafrost Groundwater Storage Changes Derived from GRACE and Ground Measurements

The Arctic is in transition from climate-driven thawing of permafrost. We investigate satellite-derived water equivalent mass changes, snow water equivalent with in situ measurements of runoff and ground-survey derived geoid models from 1999 through 2009. The Alaskan Arctic coastal plain groundwater storage (including wetland bog, thaw pond and lake) is increasing by 1.15 ± 0.65 km 3 /a (area-a...

Electric fields in the equatorial ionosphere derived from CHAMP satellite magnetic field measurements

system, equatorial vertical ion drifts, and the equatorial ionization anomaly (EIA). Due to its importance, there is much interest in accurately measuring the EEF. However, there is a severe lack of high quality data with the notable exception being the JULIA coherent scatter radar in Peru. In this work, we use CHAMP satellite-derived latitudinal current profiles of the day-time EEJ in order to...

New perspectives on thermosphere tides: 2. Penetration to the upper thermosphere

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...

Ground Measurements for the Validation of Land Surface Temperatures Derived from AATSR and MODIS Data

An experimental site was set up in a large, flat and homogeneous area of rice crops for the validation of satellite derived land surface temperature (LST). Experimental campaigns were held in the summers of 2002-04, when rice crops show full vegetation cover. LSTs were measured radiometrically along transects covering an area of 1 km. A total number of four thermal radiometers were used, which ...