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Electron Diffusion by Magnetosonic Waves in the Earth's Radiation Belts
We conduct a global survey of magnetosonic waves and compute the associated bounce and drift averaged diffusion coefficients, taking into account co-located measurements of fpe/fce, to assess the role of magnetosonic waves in radiation belt dynamics, where fpe is the plasma frequency and fce is the electron gyrofrequency.. The average magnetosonic wave intensities increase with increasing geomagnetic activity and decreasing relative frequency with the majority of the wave power in the range fcp < f < 0.3fLHR during active conditions, where fcp is the proton gyrofrequency and fLHR is the lower hybrid resonance frequency. In the region 4.0 <= L* <= 5.0, the bounce and drift averaged energy diffusion rates due to magnetosonic waves never exceed those due to whistler mode chorus, suggesting that whistler mode chorus is the dominant mode for electron energisation to relativistic energies in this region. Further in, in the region 2.0 <= L* <= 3.5, the bounce and drift averaged pitch angle diffusion rates due to magnetosonic waves can exceed those due to plasmaspheric hiss and very low frequency (VLF) transmitters over energy-dependent ranges of intermediate pitch angles. We compute electron lifetimes by solving the 1D pitch angle diffusion equation including the effects of plasmaspheric hiss, VLF transmitters and magnetosonic waves. We find that magnetosonic waves can have a significant effect on electron loss timescales in the slot region reducing the loss timescales during active times from 5.6 to 1.5 days for 500 keV electrons at L* = 2.5 and from 140.4 days to 35.7 days for 1 MeV electrons at L* = 2.0.
The research leading to these results has received funding from the Natural Environment Research Council (NERC) Highlight Topic grant NE/P01738X/1 (Rad-Sat) and the NERC grants NE/V00249X/1 (Sat-Risk) and NE/R016038/1.
Simple
- Date (Creation)
- 2022-03-24
- Date (Revision)
- 2022-03-24
- Date (Publication)
- 2022-03-24
- Date (released)
- 2022-03-24
- Edition
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1.0
- Unique resource identifier
- https://doi.org/10.5285/aae6ea2f-7dab-4ab1-830f-a4c53589e340
- Codespace
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doi
- Unique resource identifier
- GB/NERC/BAS/PDC/01628
- Codespace
- Unique resource identifier
- NE/P01738X/1
- Codespace
-
award
- Unique resource identifier
- NE/R016038/1
- Codespace
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award
- Other citation details
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Please cite this item as: Wong, J. (2022). Electron Diffusion by Magnetosonic Waves in the Earth's Radiation Belts (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/aae6ea2f-7dab-4ab1-830f-a4c53589e340
- Credit
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No credit.
- Status
- Completed
- Point of contact
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Organisation name Individual name Electronic mail address Role British Antarctic Survey Wong, Jin-Mann Author NERC EDS UK Polar Data Centre Point of contact
- Maintenance and update frequency
- As needed
- Maintenance note
- Completed
- Theme
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Electron Diffusion
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Magnetosonic Waves
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Radiation Belts
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- Place
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Van Allen Probes: Perigee ~1.1Re, Apogee ~5.8Re, Inclination 10 degrees Van Allen Radiation Belts
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GEMET - INSPIRE themes, version 1.0
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- no limitations to public access
- Access constraints
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- no limitations
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- License
- Other constraints
- Open Government Licence v3.0
- Use constraints
- Other restrictions
- Other constraints
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This data is supplied under Open Government Licence v3.0
- Use constraints
- Other restrictions
- Other constraints
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None
- Unique resource identifier
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url
- Association Type
- Cross reference
- Unique resource identifier
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url
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- Cross reference
- Unique resource identifier
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url
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- Unique resource identifier
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url
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- Cross reference
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doi
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- Cross reference
- Spatial representation type
- Text, table
- Language
- English
- Character set
- UTF8
- Topic category
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- Climatology, meteorology, atmosphere
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- Begin date
- 2012-10-01
- End date
- 2019-10-31
- Supplemental Information
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It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.
- Title
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European Petroleum Survey Group (EPSG) Geodetic Parameter Registry
- Date (Publication)
- 2008-11-12
- Cited responsible party
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Organisation name Individual name Electronic mail address Role European Petroleum Survey Group
Publisher
- Unique resource identifier
- urn:ogc:def:crs:EPSG::3031
- Version
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6.18.3
Distributor
- Distributor contact
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Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Distributor
- Distributor format
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Name Version text/csv text/plain
- Units of distribution
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bytes
- Transfer size
- 55574528
- OnLine resource
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Protocol Linkage Name WWW:LINK-1.0-http--link
https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=aae6ea2f-7dab-4ab1-830f-a4c53589e340 Get Data
- Units of distribution
-
bytes
- Transfer size
- 55574528
- OnLine resource
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Protocol Linkage Name WWW:LINK-1.0-http--link
https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=aae6ea2f-7dab-4ab1-830f-a4c53589e340 Get Data
- Hierarchy level
- Dataset
- Statement
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Methodology:
The data for the figures and generation of the diffusion coefficients come from the EMFISIS instrument on Van Allen Probes RBSP-A available online ( https://emfisis.physics.uiowa.edu/data/index). The Kp indices used in this study are available from the NSSDC Omniweb. Full details of the subsequent analysis are given in Wong et al [2022]
Data collection:
We use data from the Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) instruments on board RBSP-A. The EMFISIS Waveform Receivers on RBSP-A measured the sum of the three components of the magnetic power spectral density of the waves in 65 frequency channels, with centre frequencies between 2.13 Hz and 11.24 kHz. We also use density measurements from the EMFISIS High Frequency Receiver which measured the electric field power spectral density in the frequency range 10 kHz to 487 kHz.
Data quality:
The wave data have been calibrated and quality-controlled prior to release. We also omitted data during thruster firing, eclipse and charging times.
Metadata
- File identifier
- aae6ea2f-7dab-4ab1-830f-a4c53589e340 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Hierarchy level name
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dataset
- Date stamp
- 2022-03-24
- Metadata standard name
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ISO 19115 Geographic Information - Metadata
- Metadata standard version
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ISO 19115:2003(E)
- Metadata author
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Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Point of contact
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