Abstract:
The banded structure of Electromagnetic Ion Cyclotron (EMIC) wave spectra and their resonant interactions with radiation belt electrons depend on the cold ion composition. However, there is a great deal of uncertainty in the composition in the inner magnetosphere due to difficulties in direct flux measurements. Here we determine the sensitivity of electron diffusion by EMIC waves to the cold ion composition. The diffusion coefficients are calculated using collocated EMIC waves spectra and plasma densities observed by Van Allen Probe Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) data, parameterised by Dst, using quasi-linear theory implemented in the Pitch-Angle Diffusion of Ions and Electrons (PADIE) code.
Funding was provided by NERC Highlight Topic grant: NE/P01738X/1 (Rad-Sat), NERC grant: NE/V00249X/1 (Sat-Risk) and NERC grant: NE/R016038/1
Keywords:
EMIC, Radiation belts, electromagnetic ion cyclotron, ultrarelativistic electrons, wave-particle interactions
Ross, J. (2022). Electromagnetic ion cyclotron electron diffusion coefficients calculated using Van Allen Probe EMFISIS data for a range of ion compositions (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/2ba39ec4-c89e-4091-bdf9-e40491ec92a5
| Access Constraints: | None |
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| Use Constraints: | Data supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
| Creation Date: | 2022-08-05 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | PDC BAS |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Dr Johnathan P J Ross |
| Role(s) | Investigator, Technical Contact |
| Organisation | British Antarctic Survey |
| Name | Dr Sarah Glauert |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Prof Richard Horne |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr Nigel Meredith |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Quality: | The wave data used in this paper was from Ross et al. (2021). | |
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| Lineage: | Data sources: * OMNIWeb (https://omniweb.gsfc.nasa.gov) for the geomagnetic and solar wind indices. * Van Allen Probes data the Level 3 and Level 4 EMFISIS magnetometer data obtained from http://emfisis.physics.uiowa.edu/data/index. The wave data was processed in Ross et al. (2021) and the technique for calculating the diffusion coefficients is given in that paper. |
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| Temporal Coverage: | |
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| Start Date | 2012-09-01 |
| End Date | 2019-10-31 |
| Location: | |
| Location | Van Allen Radiation Belts |
| Detailed Location | 3.0 <= L* <= 5.5 |
| Data Collection: | Code: PADIE (Glauert, S. A., and Horne, R. B. (2005), Calculation of pitch angle and energy diffusion coefficients with the PADIE code, J. Geophys. Res., 110, A04206, doi:10.1029/2004JA010851.) |
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| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 170 kB |
| Distribution Format | N/A |
| Fees | N/A |
| Data Storage: | 3 x NetCDF files totalling 170 kB |