UV Io footprint leading spot: A key feature for understanding the UV Io footprint multiplicity?
Article first published online: 15 MAR 2008
Copyright 2008 by the American Geophysical Union.
Geophysical Research Letters
Volume 35, Issue 5, March 2008
How to Cite
2008), UV Io footprint leading spot: A key feature for understanding the UV Io footprint multiplicity? Geophys. Res. Lett., 35, L05107, doi:10.1029/2007GL032418., , , , , and (
- Issue published online: 15 MAR 2008
- Article first published online: 15 MAR 2008
- Manuscript Accepted: 31 JAN 2008
- Manuscript Revised: 18 JAN 2008
- Manuscript Received: 19 OCT 2007
- Io footprint;
- UV aurora;
 The electromagnetic interaction between Io and the Jovian magnetosphere generates a UV auroral footprint in both Jovian hemispheres. Multiple spots were observed in the northern Jovian hemisphere when Io was in the northern part of the plasma torus and vice-versa for the South. Based on recent Hubble Space Telescope (HST) measurements, we report here the discovery of a UV leading spot, i.e., a faint emission located ahead of the main spot. The leading spot emerges at System III longitudes between 0° and 100° in the northern hemisphere and between 130° and 300° in the southern hemisphere, i.e., in one hemisphere when multiple spots are observed in the other hemisphere. We propose as one potential mechanism that electron beams observed near Io are related to the generation of the leading spot and the secondary spot in the opposite hemisphere.