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Adv. Space Sec. Vol. 5, No. 12, pp.283--287, 1985 0273--1177/85 $0.00 + .50 Printed in Great Britain. All rights reserved. Copyright COSPAR
 

Summary: Adv. Space Sec. Vol. 5, No. 12, pp.283--287, 1985 0273--1177/85 $0.00 + .50
Printed in Great Britain. All rights reserved. Copyright COSPAR
HIGH SPECTRAL RESOLUTION
FABRY-PEROT INTERFEROMETER
MEASUREMENTS OF COMET
HALLEY AT H-ALPHA AND 6300 A
R. B. Kerr,~R. P. Cageao,* C. A. Tepley,**
S. K. Atreya* and T. M. Donahue~
* Department of Atmospheric and Oceanic Science, University of
Michigan, Ann Arbor, Ml 48109-2143, U.S.A.
* *Arecibo Observatory, Cornell University, P.O. Box 995,
Arecibo, PR 00613, U.S.A.
ABSTRACT
A 60.6 cm Newtonian telescope has been interfaced to the Fabry--Perot interferometer at the
Arecibo Observatory to make high spectral resolution measurements of Comet Halley emissions
at 6562.72 A (H--alpha) and 6300.3 A (01). in March 1986 the 11--alpha surface brightness for
a 5'.9 field of view centered on the comet nucleus decreased from 397.8 rayleighs on 12
March to 163.8 raXlei~hson 23 March. The atomic hydrogen production rate on 12 March 1986
was 1.620.5x lO
3" s~, and on 23 March 1986 it was 6. 762.3x i029 s1. using spectral

  

Source: Atreya, Sushil - Department of Atmospheric, Oceanic and Space Science, University of Michigan

 

Collections: Physics