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- W4378505280 abstract "Utilizing observations from the ELFIN satellites, we present a statistical study of $sim$2000 events in 2019-2020 characterizing the occurrence in magnetic local time (MLT) and latitude of $geq$50 keV electron isotropy boundaries (IBs) at Earth, and the dependence of associated precipitation on geomagnetic activity. The isotropy boundary for an electron of a given energy is the magnetic latitude poleward of which persistent isotropized pitch-angle distributions ($J_{prec}/J_{perp}sim 1$) are first observed to occur, interpreted as resulting from magnetic field-line curvature scattering (FLCS) in the equatorial magnetosphere. We find that energetic electron IBs can be well-recognized on the nightside from dusk until dawn, under all geomagnetic activity conditions, with a peak occurrence rate of almost 90% near $sim$22 hours in MLT, remaining above 80% from 21 to 01 MLT. The IBs span a wide range of IGRF magnetic latitudes from $60^circ$-$74^circ$, with a maximum occurrence between $66^circ$-$71^circ$ (L of 6-8), shifting to lower latitudes and pre-midnight local times with activity. The precipitating energy flux of $geq$50 keV electrons averaged over the IB-associated latitudes varies over four orders of magnitude, up to $sim$1 erg/cm$^2$-s, and often includes electron energies exceeding 1 MeV. The local time distribution of IB-associated energies and precipitating fluxes also exhibit peak values near midnight for low activity, shifting toward pre-midnight for elevated activity. The percentage of the total energy deposited over the high-latitude regions ($55^circ$ to $80^circ$; or IGRF $Lgtrsim 3$) attributed to IBs is 10-20%, on average, or about 10 MW of total atmospheric power input, but at times can be up to $sim$100% of the total $geq$50 keV electron energy deposition over the entire sub-auroral and auroral zone region, exceeding 1 GW in atmospheric power input." @default.
- W4378505280 created "2023-05-27" @default.
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- W4378505280 date "2023-05-25" @default.
- W4378505280 modified "2023-09-30" @default.
- W4378505280 title "Statistical Characteristics of the Electron Isotropy Boundary" @default.
- W4378505280 doi "https://doi.org/10.48550/arxiv.2305.16260" @default.
- W4378505280 hasPublicationYear "2023" @default.
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