the generation of ganymede's diffuse aurora through pitch angle scattering
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ID: 226840
2017
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Abstract
Diffuse auroral intensities of neutral atomic oxygen OI λ1356 Å emission on
Ganymede due to whistler mode waves are estimated. Pitch angle diffusion of
magnetospheric electrons into the loss cone due to resonant wave–particle
interaction of whistler mode waves is considered, and the resulting electron
precipitation flux is calculated. The analytical yield spectrum approach is used
for determining the energy deposition of electrons precipitating into the
atmosphere of Ganymede. It is found that the intensities (4–30 R)
calculated from the precipitation of magnetospheric electrons observed near
Ganymede are inadequate to account for the observational intensities (≤ 100 R). This is in agreement with the conclusions reached in previous works.
Some acceleration mechanism is required to energize the magnetospheric
electrons. In the present work we consider the heating and acceleration of
magnetospheric electrons by electrostatic waves. Two particle distribution
functions (Maxwellian and kappa distribution) are used to simulate heating
and acceleration of electrons. Precipitation of a Maxwellian distribution of
electrons can produce about 70 R intensities of OI λ1356 Å emission for electron temperature of 150 eV. A kappa distribution can also
yield a diffuse auroral intensity of similar magnitude for a characteristic
energy of about 100 eV. The maximum contribution to the estimated intensity
results from the dissociative excitation of O2. Contributions from the direct excitation
of atomic oxygen and cascading in atomic oxygen are estimated to be only about 1
and 2 % of the total calculated intensity, respectively. The findings of
this work are relevant for the present JUNO and future JUICE missions to
Jupiter. These missions will provide new data on electron densities,
electron temperature and whistler mode wave amplitudes in the magnetosphere
of Jupiter near Ganymede.
| Reference Key |
tripathi2017annalesthe
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|---|---|
| Authors | ;A. K. Tripathi;R. P. Singhal;O. N. Singh II |
| Journal | journal of food measurement and characterization |
| Year | 2017 |
| DOI |
10.5194/angeo-35-239-2017
|
| URL | |
| Keywords |
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