Würzburg 2018 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 1: Near Earth Space

EP 1.7: Vortrag

Montag, 19. März 2018, 18:30–18:45, BSZ - Pabel HS

Scaling thermospheric density of thermospheric empirical models using satellite laser ranging measurements to spherical low orbit Earth satellites — •Sergei Rudenko, Michael Schmidt, Mathis Bloßfeld, and Eren Erdogan — Deutsches Geodätisches Forschungsinstitut der Technischen Universität München (DGFI-TUM), Arcisstrasse 21, 80333 Munich, Germany

Knowledge on the density of the Earth's thermosphere and exosphere is a prerequisite for planning of satellite missions, precise orbit determination, orbit and re-entry prediction, collision avoidance of artificial satellites orbiting the Earth at altitudes below 1000 km. Thermospheric density is usually given by empirical and physical models. Empirical models have been derived from observations, such as mass spectrometer, incoherent scatter radar, orbit and accelerometer data since 1961. Precise Satellite Laser Ranging (SLR) observations (with a precision of 1-3 mm for a normal point) to spherical satellites orbiting the Earth at an altitude below 1000 km can be used to validate and calibrate these models and, if necessary, scale the thermospheric density provided by the models. We present and discuss the results of the estimation of scaling factors of the thermospheric density given by four empirical thermospheric models CIRA86, NRLMSISE00, JB2008 and DTM2013 at the periods of low and high solar activity using SLR measurements to five low-altitude (350 to 425 km) satellites ANDE-RR Active and ANDE-RR Passive (2007), ANDE Castor and ANDE Pollux (2009-2010) and SpinSat (2015-2016).