aae6ea2f-7dab-4ab1-830f-a4c53589e340 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 2022-03-24 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 Electron Diffusion by Magnetosonic Waves in the Earth's Radiation Belts 2022-03-24 creation 2022-03-24 revision 2022-03-24 publication 2022-03-24 released 1.0 https://doi.org/10.5285/aae6ea2f-7dab-4ab1-830f-a4c53589e340 doi GB/NERC/BAS/PDC/01628 https://data.bas.ac.uk/ NE/P01738X/1 award NE/R016038/1 award Please cite this item as: Wong, J. (2022). Electron Diffusion by Magnetosonic Waves in the Earth's Radiation Belts (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/aae6ea2f-7dab-4ab1-830f-a4c53589e340 We conduct a global survey of magnetosonic waves and compute the associated bounce and drift averaged diffusion coefficients, taking into account co-located measurements of fpe/fce, to assess the role of magnetosonic waves in radiation belt dynamics, where fpe is the plasma frequency and fce is the electron gyrofrequency.. The average magnetosonic wave intensities increase with increasing geomagnetic activity and decreasing relative frequency with the majority of the wave power in the range fcp < f < 0.3fLHR during active conditions, where fcp is the proton gyrofrequency and fLHR is the lower hybrid resonance frequency. In the region 4.0 <= L* <= 5.0, the bounce and drift averaged energy diffusion rates due to magnetosonic waves never exceed those due to whistler mode chorus, suggesting that whistler mode chorus is the dominant mode for electron energisation to relativistic energies in this region. Further in, in the region 2.0 <= L* <= 3.5, the bounce and drift averaged pitch angle diffusion rates due to magnetosonic waves can exceed those due to plasmaspheric hiss and very low frequency (VLF) transmitters over energy-dependent ranges of intermediate pitch angles. We compute electron lifetimes by solving the 1D pitch angle diffusion equation including the effects of plasmaspheric hiss, VLF transmitters and magnetosonic waves. We find that magnetosonic waves can have a significant effect on electron loss timescales in the slot region reducing the loss timescales during active times from 5.6 to 1.5 days for 500 keV electrons at L* = 2.5 and from 140.4 days to 35.7 days for 1 MeV electrons at L* = 2.0. The research leading to these results has received funding from the Natural Environment Research Council (NERC) Highlight Topic grant NE/P01738X/1 (Rad-Sat) and the NERC grants NE/V00249X/1 (Sat-Risk) and NE/R016038/1. 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 Electron Diffusion Magnetosonic Waves 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 This data is supplied under Open Government Licence v3.0 otherRestrictions None url url crossReference url url crossReference url url crossReference url url crossReference doi doi crossReference textTable eng utf8 climatologyMeteorologyAtmosphere -180.0 180.0 -90.0 90.0 2012-10-01 2019-10-31 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 text/plain bytes 55574528 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=aae6ea2f-7dab-4ab1-830f-a4c53589e340 WWW:LINK-1.0-http--link Get Data Download data download bytes 55574528 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=aae6ea2f-7dab-4ab1-830f-a4c53589e340 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). 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 [2022] 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. 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