1D Hybrid Simulations of Ion Cyclotron Waves Generation by Mass Loading at Io

Details 1D Hybrid Simulations of Ion Cyclotron Waves Generation by Mass Loading at Io 1D Hybrid Simulations of Ion Cyclotron Waves Generation by Mass Loading at Io

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusm.p41b..06c&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #P41B-06

Other

2152 Pickup Ions, 2753 Numerical Modeling, 6218 Jovian Satellites, 6219 Io, 7829 Kinetic Waves And Instabilities

Scientific paper

Ion cyclotron waves were detected by the Galileo spacecraft as it flew by the Jovian moon, Io, in 1995-2002. These waves are generated by populations of newborn sulfur monoxide and sulfur dioxide ions mass loaded from Io's atmosphere. Because the wave amplitudes are proportional to the number of ions generating them, the observed waves can be used to estimate the mass loading rate at Io. Using a 1D hybrid technique (kinetic ions, fluid electrons), we simulate the addition of newborn molecular sulfur ions to an Io torus-like plasma and examine the generated waves. The generated waves are narrowly peaked just below the newborn ion gyrofrequency and show little change over time for a uniform mass loading rate. Typically, the newborn ions lose ~30% of their initial energy as they scatter on the self-generated waves. Some of this energy is lost by transferring it other ion components in the plasma and some resides in the ion cyclotron waves. This disagrees with previous estimates of mass loading rates at Io assumed that the newborn ions would lose 50% of their initial energy to wave growth. Because the ions lose less energy than this, more ions are necessary in order to generate the observed wave amplitudes, so the previous mass loading rate estimates are too low.

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