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ICARUS 66, 610--618 (1986) Enhanced Acetylene Emission near the North Pole of Jupiter
 

Summary: ICARUS 66, 610--618 (1986)
Enhanced Acetylene Emission near the North Pole of Jupiter
PIERRE DROSSART, *'l BRUNO BI~ZARD,* SUSHIL ATREYA,t JOHN LACY,$ 'l
EUGENE SERABYN,§ 'l ALAN TOKUNAGA, ~'2 ANt) TH]~R]~SE ENCRENAZ*
*Observatoire de Paris, section de Meudon, 92190Meudon, France," t University of Michigan, Ann Arbor,
Michigan; ~Department for Astronomy, University of Texas, Austin, Texas 78712; §Department of Physics,
University of California, Berkeley, California 94720;and ~lnstitutefor Astronomy, Honolulu, Hawaii 96822
Received June 3, 1985; revised February 24, 1986
We report observations of acetylene emission lines near 13.3 /xm on Jupiter recorded at the
NASA Infrared Telescope Facility in July 1984. A strong enhancement in the intensity of Rt0 line of
the vs band was recorded within a well-localized region coincident with the southern extension of
footprint of the Io magnetic lines and with previous observations of localized enhanced emission of
CH4 lines. The line intensity was fairly constant outside this "bright spot." Moreover, weak lines
of the hot bands 2v5 - us, and (v4 + vs) - v5 were observed within the bright spot. From the field of
view and the precision of the pointing, the zone of activity of the bright spot is found to be: latitude
= 59 -+ 10° and longitude = 178 -+ 10° (System III, 1965). The location of the spot was found to be
constant over a 3-day period. Two interpretations are proposed to explain these observations: (1) a
variation of the C~H~ abundance and (2) an alteration of the thermal profile in the bright spot. Either
may result from precipitation of charged particles near and below the Jovian homopause. © 1986
AcademicPress, lnc.

  

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

 

Collections: Physics