fa63faf5-10d6-4c72-8b19-d41941f06812 eng utf8 dataset dataset NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom polardatacentre@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact 2023-10-19 ISO 19115 Geographic Information - Metadata ISO 19115:2003(E) European Petroleum Survey Group (EPSG) Geodetic Parameter Registry 2008-11-12 publication European Petroleum Survey Group EPSGadministrator@iogp.org https://www.epsg-registry.org/ EPSG Geodetic Parameter Dataset The EPSG Geodetic Parameter Dataset is a structured dataset of Coordinate Reference Systems and Coordinate Transformations, accessible through this online registry. information publisher urn:ogc:def:crs:EPSG::3031 6.18.3 New Chorus Diffusion Coefficients for Radiation Belt Modelling 2023-10-19 creation 2023-10-19 revision 2023-10-19 publication 2023-10-19 released 1.0 https://doi.org/10.5285/fa63faf5-10d6-4c72-8b19-d41941f06812 doi GB/NERC/BAS/PDC/01782 https://data.bas.ac.uk/ NE/P01738X/1 award NE/R016038/1 award NE/X000389/1 award Please cite this item as: Wong, J. (2023). New Chorus Diffusion Coefficients for Radiation Belt Modelling (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/fa63faf5-10d6-4c72-8b19-d41941f06812 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. No credit. completed Wong, Jin-Mann British Antarctic Survey Researcher author NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact asNeeded completed EARTH SCIENCE > Sun-earth Interactions > Ionosphere/Magnetosphere Dynamics theme Global Change Master Directory (GCMD) Science Keywords 2026-01-27 publication 23 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) Greenbelt MD United States of America https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher Chorus Waves Electron Diffusion Radiation Belts theme Van Allen Probes: Perigee ~1.1Re, Apogee ~5.8Re, Inclination 10 degrees Van Allen Radiation Belts place Atmospheric conditions theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions no limitations to public access otherRestrictions no limitations license Open Government Licence v3.0 otherRestrictions Data supplied under Open Government Licence v3.0 otherRestrictions None url url crossReference url url crossReference url url crossReference url url largerWorkCitation textTable eng utf8 climatologyMeteorologyAtmosphere -180.0 180.0 -90.0 90.0 2012-11-07 2019-10-14 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. NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information distributor text/csv bytes 17825792 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=fa63faf5-10d6-4c72-8b19-d41941f06812 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The data for the figures and generation of the diffusion coefficients come from the EMFISIS instrument on Van Allen Probes RBSP-A available online (https://emfisis.physics.uiowa.edu/data/index), and the VLF database derived in Meredith et al [2020]. The Kp indices used in this study are available from the NSSDC Omniweb. Full details of the subsequent analysis are given in Wong et al [2023] Data collection: We use data from the Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) instruments on board RBSP-A. The EMFISIS Waveform Receivers on RBSP-A measured the sum of the three components of the magnetic power spectral density of the waves in 65 frequency channels, with centre frequencies between 2.13 Hz and 11.24 kHz. We also use density measurements from the EMFISIS High Frequency Receiver which measured the electric field power spectral density in the frequency range 10 kHz to 487 kHz. The VLF database contains wave data from eight satellites, including approximately 3 years of data from Dynamics Explorer 1 (DE1), 1 year of data from Double Star TC1, 10 years of data from Cluster 1, 8 years of data from each of Time History of Events and Macroscale Interactions during Substorms (THEMIS)-A, THEMIS-D, and THEMIS-E, and 3 years of data from the Van Allen probes RBSP-A and RBSP-B. Data quality: The wave data have been calibrated and quality-controlled prior to release. We also omitted data during thruster firing, eclipse and charging times. asNeeded completed