edu.ucar.opensky::articles:24597 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T23:09:39.040342 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7n58qss https://doi.org/10.5281/zenodo.4454306 https Related Dataset #1 Solar Energetic Proton Access to the Inner Magnetosphere during the 7-8 September 2017 event Solar Energetic Proton Access to the Inner Magnetosphere During the September 7–8, 2017 Event 2021-07-01T00:00:00Z publication https://n2t.org/ark:/85065/d7n58qss https://doi.org/10.1029/2021JA029107 Li, Z. author Engel, M. author Hudson, Mary K. author Kress, B. author Patel, Maulikkumar author Qin, Murong author Selesnick, R. author UCAR/NCAR - Library publisher The access of solar energetic protons into the inner magnetosphere on September 7-8, 2017 is investigated by following reversed proton trajectories to compute the proton cutoff energy using the Dartmouth geomagnetic cutoff code (Kress et al., 2010, https://doi.org/10.1029/2009sw000488). The cutoff energies for protons coming from the west and east direction, the minimum and maximum cutoff energy respectively, are calculated every 5 min along the orbit of Van Allen Probes using TS07 and the LyonFedder-Mobarry (LFM) MHD magnetic field model. The result shows that the cutoff energy increases significantly as the radial distance decreases, and that the cutoff energy decreases with the building up of the ring current during magnetic storms. Solar wind dynamic pressure also affects cutoff suppression (Kress et al., 2004, https://doi.org/10.1029/2003gl018599). The LFM-RCM model shows stronger suppression of cutoff energy than TS07 during strong solar wind driving conditions. The simulation result is compared with proton flux measurements, showing consistent variation of the cutoff location during the September 7-8, 2017 geomagnetic storm. 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 Copyright 2021 American Geophysical Union. None eng geoscientificInformation