Loading...
Please wait, while we are loading the content...
Similar Documents
Studies of radiative transfer in planetary atmospheres (Document No: 19860007781)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Schloerb, F. P. Irvine, W. M. |
| Copyright Year | 1986 |
| Description | The research emphasis during the period of this report has been on radio observations of comets, related to the International Halley Watch. Observations of the 18 cm lambda-doublet of OH have been carried out monthly. Both of the 1667 and 1665 MHz lines have been repeatedly detected for Comets Halley, Giacobini-Zinner, Thiele, and Hartley-Good. The first astronomical detection of the weak satellite line at 1720 MHz was made for P/Halley. These data promise to supply the highest signal-to-noise-ratio data over an extended period ever obtained for cometary radio observations. Analysis will provide gas production rates as a function of heliocentric distance and allow for detailed comparisons with the OH excitation model involving ultraviolet pumping. In the case of Halley, the lines appear quite symmetric, usually being centered within 0.1 km/s with respect to the nominal nuclear velocity. Line widths have been typically within 10% of 2 km/s. There is thus little evidence for asymmetric emission in the data obtained to date. It seems likely that non-steady-state models of the coma will be required to interpret the data. Evidence for significant departures from the LTE hyperfine ratios was found for Comet Giacobini-Zinner. Smaller, but nonetheless significant, deviations have been found for Comet Halley. |
| File Size | 271159 |
| Page Count | 7 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19860007781 |
| Archival Resource Key | ark:/13960/t16m84d82 |
| Language | English |
| Publisher Date | 1986-01-15 |
| Access Restriction | Open |
| Subject Keyword | Lunar And Planetary Exploration Planetary Atmospheres Cometary Atmospheres Astronomical Observatories Signal To Noise Ratios Hydroxyl Radicals Astronomical Spectroscopy Radiative Transfer Halley's Comet Line Spectra Radio Observation 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 |
