Computer Science
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phdt........52n&link_type=abstract
Thesis (PhD). UMEA UNIVERSITET (SWEDEN), Source DAI-C 60/01, p. 147, Spring 1999, 68 pages.
Computer Science
Scientific paper
Observations of the hot plasma environments of terrestrial planets such as the Earth and Mars offer clues to the understanding of the solar-wind interaction with planetary magnetospheres, ionospheres, and atmospheres. Such studies advance our understanding of how our solar system was formed, and the long-term evolution of the Earth's atmosphere. This thesis deals with instrumentation for hot plasma measurements, and the conclusions that have been reached by interpreting data returned from satellites in orbit around the Earth and Mars. Six published papers are included in the thesis. The first two papers report on observations performed by the ASPERA experiment on-board the Phobos-2 spacecraft in the vicinity of Mars. These papers present observations of molecular ions (such as O2+ and CO2+) escaping from the Martian ionosphere and accelerated to solar wind energies, and observations of helium ions possibly originating from radioactive decay of minerals on Mars. The third and fourth papers deal with measurements of hot plasma in the Earth's ionosphere. A description of the hot plasma experiment F3H on-board the Swedish-German satellite Freja and the first interpretation of the data gathered by the experiment are given in the third paper. The fourth paper reports on solar wind plasma injections observed in the low-altitude magnetospheric cusp by the F3H experiment. Sometimes multiple, overlapping, plasma injections in the cusp are seen on the same magnetic field line, indicating that two separate plasma populations were injected to the same field line at different times. The fifth and sixth papers report on novel instrumentation developed for measuring hot plasmas. Paper five deals with the development of and first results from the Energetic Neutral Atom imager on the Swedish microsatellite Astrid. Such an imager makes it possible to 'take pictures' of hot neutral particles. These hot neutrals are created by charge exchange between hot plasma and cold neutral particles, and can hence be used to retrieve information on the hot plasma. The sixth and last paper describes the ion composition mass spectrograph developed for the Japanese Nozomi mission to Mars, and the scientific objectives with this instrument.
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