Expansion velocities of cometary gas

1974 ◽  
Vol 30 (2) ◽  
pp. 343-346 ◽  
Author(s):  
Max K. Wallis
Keyword(s):  
Cometary Gas

A high precision calibration system for the simulation of cometary gas environments

2001 ◽  
Vol 12 (9) ◽  
pp. 1594-1603 ◽  
Author(s):  
Christian B Westermann ◽  
Wolfram Luithardt ◽  
Ernest Kopp ◽  
Thomas Koch ◽  
René Liniger ◽  
...  
Keyword(s):  
High Precision ◽  
Calibration System ◽  
Cometary Gas

The effect of solar-cycle ultraviolet flux variations on cometary gas

1980 ◽  
Vol 241 ◽  
pp. L123 ◽  
Author(s):  
M. Oppenheimer ◽  
C. J. Downey
Keyword(s):  
Solar Cycle ◽  
Cometary Gas

Cometary gas and plasma flow with detailed chemistry

1988 ◽  
Vol 49 (1) ◽  
pp. 17-59 ◽  
Author(s):  
H.U. Schmidt ◽  
R. Wegmann ◽  
W.F. Huebner ◽  
D.C. Boice
Keyword(s):  
Plasma Flow ◽  
Detailed Chemistry ◽  
Cometary Gas

A model of cometary gas and dust production and nongravitational forces with application to P/Halley

Icarus ◽  
1986 ◽  
Vol 66 (1) ◽  
pp. 154-164 ◽  
Author(s):  
Fraser P. Fanale ◽  
James R. Salvail
Keyword(s):  
Dust Production ◽  
Cometary Gas ◽  
Nongravitational Forces

scholarly journals A Review of Radio Interferometric Imaging of Comets

1989 ◽  
Vol 116 (1) ◽  
pp. 175-207
Author(s):  
Imke de Pater ◽  
Patrick Palmer ◽  
Lewis E. Snyder
Keyword(s):  
Brightness Distribution ◽  
Continuum Emission ◽  
Line Profiles ◽  
Interferometric Imaging ◽  
Approximate Distance ◽  
Spectral Profiles ◽  
Co Detection ◽  
Comet Halley ◽  
Cometary Gas ◽  
Periodic Comet

AbstractWe present an overview of cometary observations carried out with the VLA. These include OH imaging observations, studies of other molecules and searches for continuum emission. Primarily, we discuss the OH observations obtained of Comet Halley, a periodic comet, and Comet Wilson, a “new” comet. The emission from Comet Halley is confined to a region a few times 105 km. The emission from Comet Wilson shows sporadic blobs at large distances (∼ 106 km from the center), which vary abruptly in both position and velocity. The generally accepted picture of excitation by UV pumping in a spherical outflow of cometary gas explains the coarse phenomenology, but other effects seem to cause significant modulations of the OH emission. We suggest that for Comet Halley, collisional effects near the edge of the quenching region, which is coincidently the approximate distance to the cometopause, may be important, and that for Comet Wilson, outgassing from cometesimals ejected from the nucleus may be significant. We further show that asymmetric line profiles are more common than previously thought. Lengthening integration times and lowering the velocity resolution results in a smooth, round shape for the comet’s brightness distribution. In addition, spectral profiles become broader and more symmetric after long integration times and after integration over larger spatial regions. In addition to the OH observations we summarize the H2CO detection experiments for comets Halley and Machholz.

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