Loading...
Please wait, while we are loading the content...
Similar Documents
Fabry-perot ground-based observations of comets and the jupiter plasma torus
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Scherb, Frank Roesler, Fred L. |
| Copyright Year | 1988 |
| Description | The Wisconsin 150 mm dual etalon Fabry-Perot spectrometer is a powerful instrument for the study of diffuse emission sources such as cometary atmospheres, the Jupiter plasma torus, and various emission nebulae. Since 1985, researchers have concentrated their efforts on extensive observations of Comet Halley and the analysis of the data. Images of Comet Halley in (OI)6300 Angstrom emission were analyzed to obtain the spatial distribution of O(1D) in the cometary atmosphere. The narrow spectral bandpass of the Fabry-Perot (0.2 Angstrom) eliminated contamination from terrestrial airglow (OI)6300 and cometary NH2 lines in the nearby spectrum. The results were modelled to provide photodestruction lifetimes of cometary Water abd OH, the predominant parents of O(1D). The Fabry-Perot was also used in the scanning mode to obtain measurements of (OI)6300 and Balmer alpha emissions which were used to determine the H, O(1D) and water production rates as a function of heliocentric distance, both pre-perihelion and post-perihelion. Researchers also analyzed high resolution spectra of the NH2 (0,8,0) band in the 6300 Angstrom region to obtain preliminary values of the NH2 production rate. Assuming NH3 is the major parent of NH2, researchers found that the abundance ratio NH3/water is about (0.12 plus or minus 0.04 percent), assuming thermal equilibrium for the level populations of NH2. |
| File Size | 99812 |
| Page Count | 2 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19890007309 |
| Archival Resource Key | ark:/13960/t52g2mq1q |
| Language | English |
| Publisher Date | 1988-08-01 |
| Access Restriction | Open |
| Subject Keyword | Lunar And Planetary Exploration Water Cometary Atmospheres High Resolution Ions Astronomical Spectroscopy Halley's Comet Fabry-perot Spectrometers Jupiter Planet Space Plasmas Airglow Comet Nuclei Acceleration Physics Comet Tails Line Spectra Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
