edu.ucar.opensky::articles:42380 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T18:05:59.392972 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.net/ark:/85065/d7nv9pkz https://doi.org/10.5281/zenodo.13316194 https Related Dataset #1 The Impact of the 8-10 March 2012 Geomagnetic Storm on Inner Zone Protons as Measured by Van Allen Probes The Impact of the 8-10 March 2012 geomagnetic storm on inner zone protons as measured by Van Allen Probes 2024-10-01T00:00:00Z publication https://n2t.net/ark:/85065/d7nv9pkz https://doi.org/10.1029/2024JA032800 Li, Z. author Engel, M. author Hudson, Mary K. author Kress, B. author Patel, M. author Selesnick, R. author UCAR/NCAR - Library publisher The Relativistic Electron Proton Telescope (REPT) instrument on the Van Allen Probes observed a double&#8208;peaked inner zone proton population throughout the 7&#160;year lifetime of the mission. M. Hudson et&#160;al. (2023) showed that a strong SEP event accompanied by a CME&#8208;shock in early March 2012 provided the Solar Energetic Proton (SEP) source for the higher L trapped proton population, which then diffused radially inward to be observed by REPT at . The study followed trajectories of SEP protons launched isotropically from a sphere at 7 Re for 2.5&#160;hr in fields calculated by the LFM&#8208;RCM global MHD model, which includes electric fields needed to model the transport and trapping of the protons by the shock, and then a radial diffusion simulation was run for 2&#160;years using the result from the test&#8208;particle simulation as the initial condition. The simulation result was compared with REPT measurement in November 2013 and showed reasonable agreement. However, the simulation overestimated the Phase Space Density by a factor of four due to lack of field line curvature scattering during the storm in the model. In this study, a test&#8208;particle simulation is performed for 2&#160;days following the injection and trapping of protons in March 2012 using TS05 fields to simulate the field line curvature scattering of the trapped SEP due to the buildup of the ring current during the geomagnetic storm. The resulting sample distribution was then weighted using the flux at the end of the two&#8208;hour MHD&#8208;test particle simulation. A radial diffusion simulation is then run using the initial profile that included the loss effect, with improved comparison with REPT measurements after 2&#160;years. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication <span style="font-family:Arial;font-size:10pt;font-style:normal;font-weight:normal;" data-sheets-root="1">Copyright 2024 American Geophysical Union (AGU).</span> None eng geoscientificInformation