Abstract:
This dataset contains two NetCDF files: Chorus_daa.nc (labelled from here as a) which contains the chorus pitch angle diffusion coefficients presented in Figure 1 of Reidy et al (2020) and Combined_daa.nc (labelled from here as b) containing the combined pitch angle diffusion coefficients which can be used to do the analysis presented in the remainder of the Reidy et al (2020) paper.
These data sets include:
a. A matrix containing the pitch angle diffusion coefficients for chorus waves at the angle of the loss cone for energies of 30, 100 and 300 keV between L*= 2-7.5, a full range of MLT sectors and for low (1 < Kp < 2), moderate (2 < Kp < 3) and high (4 < Kp < 7) geomagnetic activity levels. These were calculated from an average wave model presented in Meredith et al (2020) to capture the effect of wave-particle interactions in the BAS Radiation Belt Model (BAS-RBM). Also the arrays containing the energy, L*, MLT and Kp dependence are also included.
b, A matrix containing the combined pitch angle diffusion coefficients for chorus, hiss and EMIC waves and coulomb collisions between alpha = 0.5deg -9.45deg, Energy = 28.18-2511.89 keV , L* = 4.25-7.25, MLT = 0-24 and 6 different activity levels. The arrays containing the pitch angle, energy, L*, MLT and Kp dependence are also included.
Funding was provided by NERC Highlight Topic Grant NE/P01738X/1 and NERC National Capability grants NE/R016038/1 and NE/R016445/1
Keywords:
Pitch angle diffusion coefficients, radiation belt model, wave-particle interactions
Reidy, J. (2020). Pitch angle diffusion coefficients used to calculate electron precipitation from the Earth's radiation belts (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/1ccb7d38-48d8-4206-be34-b218fa763b5a
| Use Constraints: | This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
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| Creation Date: | 2020-07-10 |
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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 PDC |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Jade Reidy |
| Role(s) | Technical Contact, Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr Johnathan P J Ross |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr Nigel Meredith |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr Sarah Glauert |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | Abel, B., & Thorne, R. M. (1998). Electron scattering loss in earth's inner magnetosphere: 1. dominant physical processes. Journal of Geophysical Research: Space Physics, 103(A2), 2385- 2396. doi: 10.1029/97JA02919 Glauert, S. A., & Horne, R. B. (2005). Calculation of pitch angle and energy diffusion coefficients with the PADIE code. Journal of Geophysical Research (Space Physics), 110(A4), A04206. doi: 10.1029/2004JA010851 Glauert, S. A., Horne, R. B., & Meredith, N. P. (2014). Three-dimensional electron radiation belt simulations using the BAS Radiation Belt Model with new diffusion models for chorus, plasmaspheric hiss, and lightning-generate whistlers. Journal of Geophysical Research (Space Physics), 119(1), 268-289. doi: 10.1002/2013JA019281 Kersten, T., Horne, R. B., Glauert, S. A., Meredith, N. P., Fraser, B. J., and Grew, R. S. (2014), Electron losses from the radiation belts caused by EMIC waves, J. Geophys. Res. Space Physics, 119, 8820 - 8837, doi:10.1002/2014JA020366. Meredith, N. P., Horne, R. B., Shen X. C., Li, W., and Bortnik, J. (2020) Global Model of Whistler Mode Chorus in the Near-Equatorial Region (|λm| < 18°). Geophysical Research Letters, 10.1029/2020GL087311 Reidy, J. A., Horne, R.B., Glauert, S. A., Clivered, M. A., Meredith, N. P., Woodfield, E. E., Ross, J. P., Allison, H. J. and Rodger, C. J. (2020) Comparing electron precipitation fluxes calculated from pitch angle diffusion coefficients to satellite observations, Submitted to Journal of Geophysical Research |
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| Quality: | Any places where there are no data are set to NaNs. | |
| Lineage: | The diffusion coefficients for the chorus waves were derived using combined observations from seven spacecraft; these observations are binned by L*, MLT, magnetic latitude and geomagnetic activity level as described in Meredith et al. (2012, 2020). In our study we use a chorus diffusion matrix which includes the wave data-set presented in Meredith et al. (2020). To create the data set presented here (a) we interpolated over the entire diffusion matrix in pitch angle to the loss cone angle (assuming a dipole) and in energy to 30, 100 and 300 keV for the aforementioned L*, MLT and activity levels. In the second data file (b), the pitch angle diffusion coefficients for chorus waves, hiss waves (derived as described in Glauert et al. (2014)), EMIC wave (Kerston et al., 2014) and coloumb collisions (calculated as outlined in Abel and Thorne (1998)) are combined. These diffusion coefficients are initially all interpolated to the same alpha, energy, L*, MLT and activity and then added together. We present a subset of this matrix that was used for the analysis presented in Reidy et al (2020). |
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| Location: | |
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| Location | Van Allen Radiation Belts |
| Detailed Location | L* between 2 and 7.5 in 0.5L* bins |
| Data Collection: | These diffusion coefficients were initially calculated using the PADIE code (Glauert & Horne, 2005). |
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| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 1.2 MB |
| Distribution Format | netCDF |
| Fees | N/A |
| Data Storage: | This file contains two NetCDF files, one containing chorus diffusion coefficients used in Figure 1 of Reidy et al (2020) and the other containing the combined diffusion coefficients which can be used to do the analysis presented in the remainder of the Reidy et al (2020) paper. Each file contains a matrix with the diffusion coefficients, labelled daa, and arrays detailing the matrix size. a. Chorus Daa [n_energy, n_lstar, n_mlt, n_act], where n_energy, n_lstar, n_mlt and n_act are the number of elements in the arrays for energy, lstar, MLT and activity level. These are all given as separate arrays. b. Combined Daa [n_alpha, n_energy, n_lstar, n_mlt, n_act], same as previous but now the diffusion coefficients also have pitch angle dependence and the pitch angle (alpha) are given as a separate matrix. |