Tail fitting the intensity distribution of selected Saturnian lightning storm episodes
Abstract
Saturn Electrostatic Discharges or SEDs are measured by Cassini/RPWS (Radio and Plasma Wave Science) instrument at all intensities. They occur in episodes of storms with periodicity lasting close to one Saturn rotation (about 10 hours and 40 minutes). Using a computer algorithm, they are identified as events having intensities above a threshold value close to the galactic background fluctuation. SEDs, therefore, can be seen as extreme events above a threshold. In this perspective, through selected episodes that fulfill a set of criteria, we illustrate how generalized extreme-value distribution (EVD) functions can be used to find the best-fit EVD to intensity distribution of these SED episodes, and from this model EVD to deduce the total number of SEDs per episode, and to estimate the number of undetected SEDs.
- Publication:
-
European Planetary Science Congress
- Pub Date:
- April 2014
- Bibcode:
- 2014EPSC....9..796P