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We present a refined statistical analysis based on interplanetary coronalmass ejections as well as co-rotating interaction regions for the time period2003-2015 to estimate the impact of different solar wind types on thegeomagnetic activity and the neutral density in the Earth's thermosphere. Forthe time-based delimitation of the events, we rely on the catalog maintained byRichardson and Cane and the CIR-lists provided by S. Vennerstroem and Jian etal. [2011]. These archives are based on in-situ measurements from the ACEand/or the Wind spacecraft. On this basis, we thoroughly investigated 196Earth-directed ICME and 195 CIR events. To verify the impact on the Earth'sthermosphere we determined neutral mass densities by using accelerometermeasurements collected by the low-Earth orbiting satellites GRACE and CHAMP.Subsequently, the atmospheric densities are related to characteristic ICMEparameters. In this process a new calibration method has been examined. Sinceincreased solar activity may lead to a decrease of the satellites orbitalaltitude we additionally assessed the orbital decay for each of the events andsatellites. The influence of CIR events is in the same range of magnitude asthe majority of the ICMEs (186 out of 196). Even though, the extendedinvestigation period between 2011 and 2015 has a lack of extreme solar eventsthe combined analysis reveals comparable correlation coefficients between theneutral densities and the various ICME and geomagnetic parameters (mostly >0.85). The evaluation of orbit decay rates at different altitudes revealed ahigh dependency on the satellite actual altitude.

Multiple Satellite Analysis of the Earth's Thermosphere and Interplanetary Magnetic Field Variations Due to ICME/CIR Events During 2003–2015