10.34691/FK2/ANOKLO Espinoza, C.M.https://orcid.org/0000-0003-2481-2348(Universidad de Santiago de Chile)Stepanova, M.(Universidad de Santiago de Chile)Moya, P.S(Universidad de Chile)Antonova, E.E.(Lomonosov Moscow State University)Valdivia, J.A.(Universidad de Chile) Repositorio de datos de investigación de la Universidad de Chile 2019 doi:10.34691/FK2/ANOKLO/SXFRGVdoi:10.34691/FK2/ANOKLO/B2SWDXdoi:10.34691/UCHILE/ADTA9O/MKCTCFdoi:10.34691/FK2/ANOKLO/27YNZ6doi:10.34691/FK2/ANOKLO/9CAOBV We use kappa distributions to model thousands of ion and electron flux spectra along the plasma sheet and analyze the variation of the spectral index κ and the temperature T in this region. We find that κ distributions are ubiquitous and fit well ion and electron flux spectra during quiet times, and during the expansion and recovery phases of substorms. Near Earth, and up to ∼12 RE, the κ indices are different than the rest of the plasma sheet, both for ions (κi) and electrons (κe). There is a significant dawn‐dusk asymmetry in κi toward the tail, which is enhanced during substorms. The ions also exhibit a permanent temperature asymmetry, determined by a colder dawnside. The whole tail becomes hotter during substorms, but it appears that most of the energy is deposited near Earth. Calabrano, Cristián(Universidad de Chile)