Computer Science
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997icar..130...57m&link_type=abstract
Icarus, Volume 130, Issue 1, pp. 57-67.
Computer Science
33
Scientific paper
We present measurements of the mid-to-low latitude H^+_3 emission from Jupiter, derived from a spectroscopic study of the planet carried out on the United Kingdom Infrared Telescope (UKIRT) on Mauna Kea, Hawaii, on May 3-5, 1993. The measurements indicate ionospheric H^+_3 temperatures ~800 K and column densities of the order of 10^11 cm^-2. The emission levels depend strongly on latitude and longitude, but are generally of the order of 10^-1 erg s^-1 cm^-2, indicating that the cooling effect of H^+_3 is a significant factor in the ionosphere. These emission levels also strongly suggest either that aurorally produced H^+_3 is being transported to nonauroral latitudes or that sources in addition to solar EUV are required to produce the ionisation and excitation energy necessary to account for the observed H^+_3 emission. This view is supported by comparing the emission profiles as a function of latitude with those obtained from a jovian global circulation model which has auroral electron precipitation and solar EUV as ionisation inputs. The spatial distribution of H^+_3 emission suggests that this ion may be a useful probe of Jupiter's magnetic field at subauroral latitudes.
Achilleos Nicholas
Ballester Gilda E.
Geballe Thomas Ronald
Lam Hoanh An
Miller Steven
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