The Interplanetary Lyman Alpha Background Observed by HDAC onboard Cassini

Details The Interplanetary Lyman Alpha Background Observed by HDAC onboard Cassini The Interplanetary Lyman Alpha Background Observed by HDAC onboard Cassini

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p43a1656k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P43A-1656

Physics

[6299] Planetary Sciences: Solar System Objects / General Or Miscellaneous

Scientific paper

The hydrogen and deuterium absorption cells (HDAC) are part of the ultraviolet imaging spectrometer (UVIS, Esposito et al. 2004) onboard the Cassini spacecraft. The absorption cells of HDAC scan the Lyman Alpha emission lines of hydrogen and deuterium atoms by varying the cell optical depths (degree of dissociation of the internal molecules) and the radial velocity between the spacecraft and the source. In the photometer mode the absorption cells are not switched on and only the CEM detector is used to register the signals within a 3 degree field of view. HDAC in photometer mode was frequently switched on already during cruise to Saturn. When the Cassini spacecraft transmits data to earth it is rotating and HDAC can scan the Lyman Alpha background perpendicular to the rotation axis. The HDAC data set covers 6 years of observations along the spacecraft track from earth to Saturn at 10 AU. From 2004 on the observational point follows the position of Saturn on its orbit around the sun. By the end of the Cassini mission almost 180° of ecliptic longitude will be covered. The photometer data set together with occasional absorption cell scans will be used to investigate the interstellar hydrogen streaming through the solar system by comparison to existing elaborate models (Lallement et al. 2010).

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