Home » Thorne et al. 2005

Timescale for MeV electron microburst loss during geomagnetic storms

Thorne R. M., T. P. O’Brien, Y. Y. Shprits, D. Summers, R. B. Horne, (2005), Timescale for MeV electron microburst loss during geomagnetic storms, J. of Geophys. Res. [Space Physics], 110, doi:10.1029/2004JA010882

Abstract

Energetic electrons in the outer radiation belt can resonate with intense bursts of whistler-mode chorus emission leading to microburst precipitation into the atmosphere. The timescale for removal of outer zone MeV electrons during the main phase of the October 1998 magnetic storm has been computed by comparing the rate of microburst loss observed on SAMPEX with trapped flux levels observed on Polar. Effective lifetimes are comparable to a day and are relatively independent of L shell. The lifetimes have also been evaluated by theoretical calculations based on quasi-linear scattering by field-aligned waves. Agreement with the observations requires average wide-band wave amplitudes comparable to 100 pT, which is consistent with the intensity of chorus emissions observed under active conditions. MeV electron scattering is most efficient during first-order cyclotron resonance with chorus emissions at geomagnetic latitudes above 30 degrees. Consequently, the zone of MeV microbursts tends to maximize in the prenoon (0400–1200 MLT) sector, since nightside chorus is more strongly confined to the equator.

Authors (sorted by name)

Horne O’Brien Shprits Summers Thorne

Journal / Conference

Journal Of Geophysical Research (Space Physics)

Acknowledgments

This research was funded in part by NASA grants NAG5‐11922 and NNG04GN44G. The work was also supported by NSF GEM grant ATM‐0402615. We thank R. Selesnick and M. Looper for assistance with the Polar and SAMPEX data. D. S. acknowledges support from the Natural Sciences and Engineering Research Council of Canada under grant A‐0621.

Grants

ATM-0402615 NAG5‐11922 NNG04GN44G

Bibtex

@article{doi:10.1029/2004JA010882,
author = {Thorne, R. M. and O'Brien, T. P. and Shprits, Y. Y. and Summers, D. and Horne, R. B.},
title = {Timescale for MeV electron microburst loss during geomagnetic storms},
journal = {Journal of Geophysical Research: Space Physics},
volume = {110},
number = {A9},
year = {2005},
pages = {},
keywords = {microburst precipitation, MeV electron lifetime, geomagnetic storms},
doi = {10.1029/2004JA010882},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2004JA010882},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2004JA010882},
abstract = {Energetic electrons in the outer radiation belt can resonate with intense bursts of whistler-mode chorus emission leading to microburst precipitation into the atmosphere. The timescale for removal of outer zone MeV electrons during the main phase of the October 1998 magnetic storm has been computed by comparing the rate of microburst loss observed on SAMPEX with trapped flux levels observed on Polar. Effective lifetimes are comparable to a day and are relatively independent of L shell. The lifetimes have also been evaluated by theoretical calculations based on quasi-linear scattering by field-aligned waves. Agreement with the observations requires average wide-band wave amplitudes comparable to 100 pT, which is consistent with the intensity of chorus emissions observed under active conditions. MeV electron scattering is most efficient during first-order cyclotron resonance with chorus emissions at geomagnetic latitudes above 30 degrees. Consequently, the zone of MeV microbursts tends to maximize in the prenoon (0400–1200 MLT) sector, since nightside chorus is more strongly confined to the equator.}
}