New Chorus Diffusion Coefficients for Radiation Belt Modelling
Whistler mode chorus is an important magnetospheric wave emission playing a major role in radiation belt dynamics, where it contributes to both the acceleration and loss of relativistic electrons. In this study we compute bounce and drift averaged chorus diffusion coefficients for 3.0 < L* < 6.0, using the TS04 external magnetic field model, taking into account co-located near-equatorial measurements of the wave intensity and fpe/fce, by combining the Van Allen probes measurements with data from a multi-satellite VLF wave database. The variation of chorus wave normal angle with spatial location and fpe/fce is also taken into account. We find that chorus propagating at small wave normal angles has the dominant contribution to the diffusion rates in most MLT sectors. However, in the region 4 <= MLT < 11 high wave normal angles dominate at intermediate pitch angles. In the region 3 < L* < 4, the bounce and drift averaged pitch angle and energy diffusion rates during active conditions are primarily larger than those in our earlier models by up to a factor of 10 depending on energy and pitch angle. Further out, the results are similar. We find that the bounce and drift averaged energy and pitch angle diffusion rates can be significantly larger than the new model in regions of low fpe/fce,eq, where the differences can be up to a factor of 10 depending on energy and pitch angle.
Funding was provided by the Natural Environment Research Council (NERC) Highlight Topic grant NE/P01738X/1 (Rad-Sat) and the NERC grants NE/V00249X/1 (Sat-Risk), NE/R016038/1 and NE/X000389/1.
Simple
- Alternate title
- Polar Data Centre (PDC) record GB/NERC/BAS/PDC/01782
- Date (Publication)
- 2023-10-19
- Identifier
- http://www.antarctica.ac.uk/dms/metadata.php?id= / GB/NERC/BAS/PDC/01782
- Maintenance and update frequency
- unknown Unknown
- Keywords
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- NDGO0001
- NERC OAI Harvesting
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- NERC_DDC
- GCMD Parameter Valids
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- EARTH SCIENCE > Sun-earth Interactions > Ionosphere/Magnetosphere Dynamics
- BAS Free-text keywords
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- Chorus Waves
- Electron Diffusion
- Radiation Belts
- Use limitation
- Data supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.
- Access constraints
- otherRestrictions Other restrictions
- Other constraints
- Data supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.
- Metadata language
- EnglishEnglish
- Topic category
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- Climatology, meteorology, atmosphere
- Begin date
- 2012-11-07
- End date
- 2019-10-14
- Reference system identifier
- OGP / urn:ogc:def:crs:EPSG::4326
- Distribution format
-
- Hierarchy level
- dataset Dataset
Domain consistency
- Measure identification
- INSPIRE / Conformity_001
Conformance result
- Date
- Explanation
- See the referenced specification
- Pass
- No
- Statement
- The wave data have been calibrated and quality-controlled prior to release. We also omitted data during thruster firing, eclipse and charging times.
- File identifier
- GB_NERC_BAS_PDC_01782 XML
- Metadata language
- EnglishEnglish
- Hierarchy level
- dataset Dataset
- Date stamp
- 2023-10-19
- Metadata standard name
- NERC profile of ISO19115:2003
- Metadata standard version
- 1.0