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- W2100035984 abstract "Results are given of the calculations of the group delay time propagating τ(ω, φ0) of hydromagnetic whistlers, using outer ionospheric models closely resembling actual conditions. The τ(ω, φ0) dependencies were compared with the experimental data of τexp(ω, φ0) obtained from sonagrams. The sonagrams were recorded in the frequency range ƒ ⋍ (0.5−2.5) Hz at observation points located at geomagnetic latitudes φ0 = (53−66)° and in the vicinity of the geomagnetic poles. This investigation has led us to new and important conclusions. The wave packets (W.P.) forming hydromagnetic whistlers (H.W.) are mainly generated in the plasma regions at L = 3.5−4.0. This is not consistent with ideas already expressed in the literature that their generation region is L ⋍ 3−10. The overwhelming majority of the τexp values differ considerably from the times at which wave packets would, in theory, propagate along the magnetic field lines corresponding to those of the geomagnetic latitudes φ0 of the observation points. The second important fact is that the W.P. frequency ω is less than ΩH everywhere along its propagation trajectory, including the apogee of the magnetic force line (ΩH is the proton gyrofrequency). Proton flux spectra E ⋍ (30−120) keV, responsible for H.W. generation, were determined. Comparison of the Explorer-45 and OGO-3 measurements published in the literature, with our data, showed that the proton flux density energy responsible for the H.W. excitation Np(MV‖22) ⋍ (5 × 10−3−10−1) Ha28π where Ha is the magnetic field force in the generation region of these W.P. The electron concentration is Na ⋍ (102−103) cm−3. The values given in the literature are Na ⋍ (10−10−103) cm−3. The e data considered also leads to the conclusion that the generating mechanism of the W.P. studied probably always co-exists with the mechanism of their amplification." @default.
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- W2100035984 date "1977-05-01" @default.
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- W2100035984 title "The locating of hydromagnetic whistler sources and determination of their generating proton spectra" @default.
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- W2100035984 doi "https://doi.org/10.1016/0032-0633(77)90081-2" @default.
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