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| Titel |
Assessing the Impact of Earth Radiation Pressure Acceleration on Low-Earth Orbit Satellites |
| VerfasserIn |
Kristin Vielberg, Ehsan Forootan, Christina Lück, Jürgen Kusche, Klaus Börger |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149947
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| Publikation (Nr.) |
 EGU/EGU2017-14358.pdf |
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| Zusammenfassung |
| The orbits of satellites are influenced by several external forces. The main non-gravitational
forces besides thermospheric drag, acting on the surface of satellites, are accelerations due to
the Earth and Solar Radiation Pres- sure (SRP and ERP, respectively). The sun radiates
visible and infrared light reaching the satellite directly, which causes the SRP. Earth
also emits and reflects the sunlight back into space, where it acts on satellites. This
is known as ERP acceleration. The influence of ERP increases with decreasing
distance to the Earth, and for low-earth orbit (LEO) satellites ERP must be taken
into account in orbit and gravity computations. Estimating acceler- ations requires
knowledge about energy emitted from the Earth, which can be derived from satellite
remote sensing data, and also by considering the shape and surface material of a
satellite.
In this sensitivity study, we assess ERP accelerations based on different input albedo and
emission fields and their modelling for the satellite missions Challenging Mini-Satellite
Payload (CHAMP) and Gravity Recovery and Climate Experiment (GRACE). As input
fields, monthly 1∘x1∘ products of Clouds and the Earth’s Radiant En- ergy System (CERES),
L3 are considered. Albedo and emission models are generated as latitude-dependent, as well
as in terms of spherical harmonics. The impact of different albedo and emission models as
well as the macro model and the altitude of satellites on ERP accelerations will be
discussed. |
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