A ULF wave driver of ring current energization
نویسندگان
چکیده
منابع مشابه
Energization of relativistic electrons in the presence of ULF power and MeV microbursts: Evidence for dual ULF and VLF acceleration
[1] We examine signatures of two types of waves that may be involved in the acceleration of energetic electrons in Earth’s outer radiation belts. We have compiled a database of ULF wave power from SAMNET and IMAGE ground magnetometer stations for 1987– 2001. Long-duration, comprehensive, in situ VLF/ELF chorus wave observations are not available, so we infer chorus wave activity from low-altitu...
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[1] It has recently been noted that FAST (Fast Auroral SnapshoT) mission data of auroral current systems associated with Alfvén waves has an electron kinetic energy flux density that is similar to the Poynting vector [Chaston et al., 2002]. In Ultra-Low-Frequency (ULF) wave theory, which considers global wave modes of the magnetosphere (with frequency 1–5 mHz), the traditional dissipation mecha...
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[1] Using a discrete wavelet transform with a Meyer wavelet basis, we present a new quantitative algorithm for determining the onset time of Pi1 and Pi2 ULF waves in the nightside ionosphere with 20to 40-s resolution at substorm expansion phase onset. We validate the algorithm by comparing both the ULF wave onset time and location to the optical onset determined by the Imager for Magnetopause-t...
متن کاملAnalytic expressions for ULF wave radiation belt radial diffusion coefficients
We present analytic expressions for ULF wave-derived radiation belt radial diffusion coefficients, as a function of L and Kp, which can easily be incorporated into global radiation belt transport models. The diffusion coefficients are derived from statistical representations of ULF wave power, electric field power mapped from ground magnetometer data, and compressional magnetic field power from...
متن کاملA comparison of EISCAT and HF Doppler observations of a ULF wave
Since the middle of 1995, an HF Doppler sounder has been running almost continuously in northern Norway, with the receiver at Ramfjordmoen and the transmitter at Seljelvnes. Concurrent operation of the EISCAT UHF radar in common programme (CP-1) mode has made it possible to study the ionospheric signature of a magnetospheric ULF wave. These are the ®rst results of such wave signatures observed ...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2014
ISSN: 0094-8276
DOI: 10.1002/2014gl061253