Phenomenological analysis of Jovian north auroral H2 Lyman band emissions

Details Phenomenological analysis of Jovian north auroral H2 Lyman band emissions Phenomenological analysis of Jovian north auroral H2 Lyman band emissions

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a..97l&link_type=abstract

In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 97-100 (SEE N89-10682 01-89)

Astronomy and Astrophysics

Astronomy

Auroras, Deuterium, Iue, Jupiter Atmosphere, Lyman Alpha Radiation, Spaceborne Astronomy, Ultraviolet Astronomy, Emission Spectra, Phenomenology, Transmittance

Scientific paper

Low-dispersion spectra taken with the IUE SWP from 1981 to 1988 are examined for gross longitudinal features in Jovian north auroral emission activity and for evidence of long-term trends in auroral characteristics. Integrated photon flux in the H2 Lyman-band region is extracted from each of the spectra, characterizing auroral emission strength at time of exposure. A plot of flux vs Jovian central meridian longitude (System III) corroborates an enhanced emission region centered at 180 deg reported by Skinner et al., (1984). Curves fit to fluxes grouped as scans (consecutive exposures made over a single Jovian rotation) vs longitude characterize width, position, and intensity of the enhanced region. Long-term variation in auroral peak intensity and width of the enhanced region vs time, as well as possible correlation of the light curve integrated over longitude as a measure of total power emitted, vs the longitudinal position of the intensity peak were studied. More energetic aurorae appear to peak at values of central meridian longitude lower than the previously reported 180 deg. Longitudinal dependence in the ratio of photon flux in the Lyman and Werner bands, an indicator of primary particle energy, is analyzed.

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