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Pitch angle diffusion coefficients used in comparison of quasi-linear diffusion theory with in-situ measurements
These data include pitch angle diffusion coefficients for chorus waves which have been evaluated at the angle of loss cone calculated in multiple ways. We have predominately concentrated on the dawnside between 00-12 MLT (Magnetic Local Time), for 5<L*<5.5 as this is where we have Van Allen Radiation Belt Storm Probes (RBSP) measurements and scattering of electrons due to chorus waves is known to occur. We have used 7 years of RBSP wave and cold plasma measurements between November 2012 to October 2019 to calculate these diffusion coefficients. For the first two sets of data we provide chorus diffusion coefficients with fpe/fce times by 2 and divided by 2 respectively. The next four data sets have been calculated from RBSP data using two different methods, first using average values, as has previously been done (e.g. Horne et al [2013]) and used above, and secondly by using co-located measurements of the wave spectra and fpe/fce to calculate pitch angle diffusion coefficients (Daa), where fpe is the plasma frequency and fce is the proton gyro frequency, and then averaging, similar to that presented in Ross et al [2021] for Electromagnetic Ion Cyclotron (EMIC) waves and Wong et al [2022] for magnetosonic waves. Both methods use a modified version of the PADIE code Glauert et al [2005] which allows an arbitrary wave power spectral density input rather than Gaussian inputs. The RBSP chorus diffusion coefficient matrices are computed by combining RBSP data with a profile for how chorus wave power changes with latitude, derived from the VLF database in Meredith et al [2018]. The magnetic latitude profile enables us to map RBSP measurements to magnetic latitudes between 0<MLAT<60 and therefore include the effects of high latitude chorus in our results. The RBSP diffusion matrices also use a new chorus wave normal angle model derived from RBSP data composed of different wave normal angle distributions for different spatial location and fpe/fce bins. Lastly we include two data sets of RBSP-chorus diffusion coefficients combined with diffusion coefficients due to collisions with atmospheric particles to calculate the total diffusion of electrons near the loss cone between 00-12 MLT, for 5<L*<5.5. We have produced these different sets of chorus (and combined chorus and collision) diffusion coefficients to test our methods of calculating electron precipitation and find what variables these calculations are sensitive to.
Funding was provided by NERC Highlight Topic Grant NE/P01738X/1 (Rad-Sat) and NERC National Capability grants NE/R016038/1 and NE/R016445/1
Simple
- Date (Creation)
- 2023-07-13
- Date (Revision)
- 2023-07-13
- Date (Publication)
- 2023-07-13
- Date (released)
- 2023-07-13
- Edition
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1.0
- Unique resource identifier
- https://doi.org/10.5285/5ef0d6cd-67c2-48fc-8a6a-dfe44a63979e
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doi
- Unique resource identifier
- GB/NERC/BAS/PDC/01762
- Codespace
- Unique resource identifier
- NE/P01738X/1
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award
- Unique resource identifier
- NE/R016038/1
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award
- Unique resource identifier
- NE/R016445/1
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award
- Other citation details
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Please cite this item as: Reidy, J., Ross, J., & Wong, J. (2023). Pitch angle diffusion coefficients used in comparison of quasi-linear diffusion theory with in-situ measurements (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/5ef0d6cd-67c2-48fc-8a6a-dfe44a63979e
- 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 Reidy, Jade Author British Antarctic Survey Ross, Johnathan Author 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 precipitation
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pitch angle diffusion coefficients
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radiation belt model
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wave-particle interactions
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- Place
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Van Allen Radiation Belts
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GEMET - INSPIRE themes, version 1.0
- Access constraints
- Other restrictions
- Other constraints
- no limitations to public access
- Access constraints
- Other restrictions
- Other constraints
- no limitations
- Use constraints
- License
- Other constraints
- Open Government Licence v3.0
- Use constraints
- Other restrictions
- Other constraints
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Data released under the Open Government Licence V3.0 :
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doi
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- Spatial representation type
- Text, table
- Language
- English
- Character set
- UTF8
- Topic category
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- Geoscientific information
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- Begin date
- 2012-11-01
- 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 application/x-hdf application/netcdf
- Units of distribution
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bytes
- Transfer size
- 106496
- 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=5ef0d6cd-67c2-48fc-8a6a-dfe44a63979e Get Data
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bytes
- Transfer size
- 106496
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Protocol Linkage Name WWW:LINK-1.0-http--link
https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=5ef0d6cd-67c2-48fc-8a6a-dfe44a63979e Get Data
- Hierarchy level
- Dataset
- Statement
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Methodology:
The chorus diffusion coeffcients for (a) and (b) 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. (2020) but calculated with either fpe/fce divided or times by 2.
The chorus diffusion coefficients for (c) and (d) were calculated using solely RBSP wave measurements, as opposed to the entire wave data base with data from seven different satellites discussed above. The old and new method refers to the whether the wave data were combined before or after the average was taken, as described in Ross et al (2020) and Wong et al (2022).
All four chorus matrix files were calculated using the PADIE code (Glauert & Horne, 2005).
For files (e) - (h) - the above chorus diffusion coefficients from (a)- (d) were combined with diffusion coefficients for coulomb collisions (calculated as outlined in Abel and Thorne (1998)).
Data collection:
These diffusion coefficients were initially calculated using the PADIE code (Glauert & Horne, 2005).
Data quality:
Any places where there are no data are set to NaNs.
Metadata
- File identifier
- 5ef0d6cd-67c2-48fc-8a6a-dfe44a63979e XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Hierarchy level name
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dataset
- Date stamp
- 2023-07-13
- 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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