Journal article
Electron acceleration at Jupiter: input from cyclotron-resonant interaction with whistler-mode chorus waves
Annales geophysicae (1988), Vol.31(10), pp.1619-1630
10/02/2013
DOI: 10.5194/angeo-31-1619-2013
Abstract
Jupiter has the most intense radiation belts of all the outer planets. It is not yet known how electrons can be accelerated to energies of 10MeV or more. It has been suggested that cyclotron-resonant wave-particle interactions by chorus waves could accelerate electrons to a few MeV near the orbit of Io. Here we use the chorus wave intensities observed by the Galileo spacecraft to calculate the changes in electron flux as a result of pitch angle and energy diffusion. We show that, when the bandwidth of the waves and its variation with L are taken into account, pitch angle and energy diffusion due to chorus waves is a factor of 8 larger at L-shells greater than 10 than previously shown. We have used the latitudinal wave intensity profile from Galileo data to model the time evolution of the electron flux using the British Antarctic Survey Radiation Belt (BAS) model. This profile confines intense chorus waves near the magnetic equator with a peak intensity at similar to 5 degrees latitude. Electron fluxes in the BAS model increase by an order of magnitude for energies around 3 MeV. Extending our results to L = 14 shows that cyclotron-resonant interactions with chorus waves are equally important for electron acceleration beyond L = 10. These results suggest that there is significant electron acceleration by cyclotron-resonant interactions at Jupiter contributing to the creation of Jupiter's radiation belts and also increasing the range of L-shells over which this mechanism should be considered.
Details
- Title: Subtitle
- Electron acceleration at Jupiter: input from cyclotron-resonant interaction with whistler-mode chorus waves
- Creators
- E. E. Woodfield - British Antarctic SurveyR. B. Horne - British Antarctic SurveyS. A. Glauert - British Antarctic SurveyJ. D. Menietti - University of IowaY. Y. Shprits - University of California, Los Angeles
- Resource Type
- Journal article
- Publication Details
- Annales geophysicae (1988), Vol.31(10), pp.1619-1630
- Publisher
- Copernicus Gesellschaft Mbh
- DOI
- 10.5194/angeo-31-1619-2013
- ISSN
- 0992-7689
- eISSN
- 1432-0576
- Number of pages
- 12
- Grant note
- bas0100023 / NERC; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC) bas0100023 / Natural Environment Research Council; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC) NERC; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC) ST/I001727/1 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) ST/I001727/1 / Science and Technology Facilities Council; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) NNX11AM36G / NASA; National Aeronautics & Space Administration (NASA)
- Language
- English
- Date published
- 10/02/2013
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627226602771
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