Abstract:
Drift-averaged pitch angle diffusion coefficients, and derived pitch angle distributions and loss timescales for electrons with energies from 100 keV to 4 MeV, L* in the range 2 to 7 and geomagnetic activity determined by the Kp index. The pitch angle distributions and loss timescales, for use in radiation belt models, are calculated from the diffusion coefficients assuming pure pitch angle diffusion and steady decay of the distribution.
Funding was provided by NERC grant NE/V00249X/1 (Sat-Risk)
Keywords:
Loss timescales, Pitch angle distributions, Radiation belts
Glauert, S., & Ross, J. (2024). Pitch angle distributions, loss timescales and diffusion coefficients for the Earth's radiation belts (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/6d20ed7b-59e1-4284-a6f2-3e2589da6d2a
| Use Constraints: | This data is covered by a UK Open Government Licence (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/). Further by downloading this data the user acknowledges that they agree with the NERC data policy (http://www.nerc.ac.uk/research/sites/data/policy.asp), and the following conditions: |
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| Creation Date: | 2024-04-05 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK Polar Data Centre |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Dr Sarah Glauert |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Jack W Atkinson |
| Role(s) | Investigator |
| Organisation | University of Cambridge |
| Name | Dr Johnathan P J Ross |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Prof Richard Horne |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | Associated publication: S.A. Glauert, J.W. Atkinson, R.B. Horne and J.P. Ross, (in review), A new model for electron pitch angle distributions and loss timescales in the Earth's radiation belts Journal of Geophysical Research: Space Physics. Methodology references: Albert, J. M. (1994). Quasi-linear pitch angle diffusion coefficients: Retaining high harmonics. Journal of Geophysical Research: Space Physics, 99(A12), 23741-23745. https://doi.org/10.1029/94JA02345 L* in spatial coverage determined using the Olson-Pfitzer model [Olson, W. P., & Pfitzer, K. A., 1977. Magnetospheric magnetic field modeling. Mc- Donnell Douglas Astronautics Co., Huntington Beach, California.]. |
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| Quality: | Only model output is provided. | |
| Lineage: | The modelling used to create the dataset is detailed in Glauert et al., (JGR, 2024). Pitch angle diffusion coefficients describing wave-electron interactions for all the VLF waves commonly observed in the radiation belts were created by combining results from multiple publications. Using these, pitch angle distributions and loss timescales were calculated following the approach from Albert (1994, doi: 10.1029/94JA02345), using the routine D02GAF from the Numerical Algorithms Group (NAG) Library to solve the equations. This results in three data sets: pitch angle diffusion coefficients that vary with pitch angle, energy, L* and geomagnetic activity (defined by the Kp index) and corresponding pitch angle distributions and loss timescales. Funding: NERC grant NE/V00249X/1 (Sat-Risk) |
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| Location: | |
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| Location | N/A |
| Detailed Location | 2 <= L* <= 7 with L* determined using the Olson-Pfitzer model |
| Data Collection: | Only model output is provided. |
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| Data Storage: | 3 data files. Each file is plain text with a header describing the layout of the contents. Glauert2024_PitchAngleDiffusionCoefficients.dat (30 MB) Glauert2024_PitchAngleDistributions.dat (1.3 MB) Glauert2024_LossTimescales.dat (37 KB) |
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