Rapidly Varying Emissions in Jupiter's Polar Cap: A Signature of Reconnection in the Jovian Magnetotail?

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Jupiter's aurora is known to vary on time scales ranging from minutes to years at wavelengths that span the electromagnetic spectrum, from radio to x-ray wavelengths. Recent time-tagged Hubble Space Telescope/STIS ultraviolet images extend the observations of jovian auroral variability into the temporal regime of seconds. Evident in the STIS images are large-scale emission features in the northern polar cap that vary rapidly on a time scale of tens of seconds. Among these recently observed features is a dramatic, surge-like brightening. The rapidly varying polar cap emissions may be a signature of magnetic reconnection in the jovian magnetotail. We explore this possibility in this talk and compare the polar cap emissions seen at Jupiter with similar emissions at Earth.

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