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IBEX Backgrounds and Signal-to-Noise Ratio |
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| Authors: | P Wurz S A Fuselier E Möbius H O Funsten P C Brandt F Allegrini A G Ghielmetti R Harper E Hertzberg P Janzen H Kucharek D J McComas E C Roelof L Saul J Scheer M Wieser Y Zheng |
| Institution: | 1. Physics Institute, University of Bern, Sidlerstrasse 5, 3012, Bern, Switzerland 2. Space Physics Department, Lockheed Martin Advanced Technology Center, 3251 Hanover Street, Palo Alto, CA, 94304, USA 3. Space Science Center and Department of Physics, University of New Hampshire, 39 College Road, Durham, NH, 03824, USA 4. Los Alamos National Laboratory, Los Alamos, NM, 87545, USA 6. Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD, 20723, USA 7. Space Science and Engineering Division, Southwest Research Institute, San Antonio, TX, 78228-0510, USA 8. Department of Physics & Astronomy, University of Montana, 32 Campus Drive, Missoula, MT, 59812, USA 5. Swedish Institute of Space Physics, Box 812, 98128, Kiruna, Sweden |
| Abstract: | The Interstellar Boundary Explorer (IBEX) mission will provide maps of energetic neutral atoms (ENAs) originating from the boundary region of our heliosphere. On IBEX there are two sensors, IBEX-Lo and IBEX-Hi, covering the energy ranges from 10 to 2000 eV and from 300 to 6000 eV, respectively. The expected ENA signals at 1 AU are low, therefore both sensors feature large geometric factors. In addition, special attention has to be paid to the various sources of background that may interfere with our measurement. Because IBEX orbits the Earth, ion, electron, and ENA populations of the Earth’s magnetosphere are prime background sources. Another potential background source is the magnetosheath and the solar wind plasma when the spacecraft is outside the magnetosphere. UV light from the night sky and the geocorona have to be considered as background sources as well. Finally background sources within each of the sensors must be examined. |
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