Resonant scattering of near-equatorially mirroring electrons by Landau resonance with H + band EMIC waves

By investigating the resonant energy and latitudinal resonance region of Landau 28 resonance between H + band EMIC waves and radiation belt electrons and performing 29 calculations of quasi-linear diffusion coefficients, we find that Landau resonance with 30 EMIC waves, characterized by a very broad range of resonant energies from below 1 31 eV to above 10 MeV and the strikingly small extent of the latitudinal resonance region 32 well below 0.1°, can be a feasible candidate accounting for the pitch angle scattering of 33 near-equatorially mirroring electrons. Compared to the dominant pitch angle scattering 34 caused by the cyclotron resonance for > ~ 2 MeV electrons at equatorial pitch angles < 35 ~ 80° with the rates well above 10 -4 s -1 , Landau resonance with H + band EMIC waves 36 has the potential to drive more efficient pitch angle scattering of radiation belt electrons 37 from ~ 10 MeV down to 10’s keV at equatorial pitch angles > ~ 85°.