Spectral monitoring of comet Shoemaker-Levy 9 impact sites on Jupiter.

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Jupiter: Comets, Jupiter: Impacts

Scientific paper

Spectral monitoring of comet Shoemaker-Levy 9 impact sites on Jupiter was carried out at the Crimean Astrophysical Observatory from 12 Jul - 30 Aug 1994. A television complex mounted at a 50-cm meniscus telescope was used, the exposure time was 6 - 26 s, the spectral resolution was 2 nm until 27 Jul and 0.7 nm afterwards. Statistical processing of 300 spectrograms obtained from 16 to 22 Jul revealed the bands of methane, ammonia, and hydroxyl, as well as the lines of H2, H, Na, Ca, Li, Fe. Fast variability of these features was recorded at the impact sites and in the plume Q2. Study of the spectra obtained on 20 Jul makes it apparent that the sodium doublet lines varied rapidly over the entire Jupiter disk and not only at the Q2 impact site. The sodium emission region was at a distance of 3 RJ from the Jupiter center. The authors suggest that sodium was excited by fast electrons in the Jovian inner magnetosphere, the disintegrating small pieces of the Q fragment being the source of sodium atoms.

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