A reexamination of latitudinal limits of substorm-produced energetic electron precipitation

被引:32
作者
Cresswell-Moorcock, Kathy [1 ]
Rodger, Craig J. [1 ]
Kero, Antti [2 ]
Collier, Andrew B. [3 ]
Clilverd, Mark A. [4 ]
Haggstrom, Ingemar [5 ]
Pitkanen, Timo [6 ]
机构
[1] Univ Otago, Dept Phys, Dunedin 9016, New Zealand
[2] Univ Oulu, Sodankyla Geophys Observ, Sodankyla, Finland
[3] SANSA Space Sci, Hermanus, South Africa
[4] British Antarctic Survey NERC, Cambridge, England
[5] EISCAT Sci Assoc, Kiruna, Sweden
[6] Univ Oulu, Dept Phys, FIN-90570 Oulu, Finland
基金
芬兰科学院;
关键词
substorms; electron precipitation; latitudinal limits; POES observations; MAGNETOSPHERIC SUBSTORMS; INJECTION; EVOLUTION; DYNAMICS;
D O I
10.1002/jgra.50598
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The primary sources of energetic electron precipitation (EEP) which affect altitudes <100km (>30keV) are expected to be from the radiation belts and during substorms. EEP from the radiation belts should be restricted to locations between L=1.5 and 8, while substorm-produced EEP is expected to range from L=4 to 9.5 during quiet geomagnetic conditions. Therefore, one would not expect any significant D region impact due to electron precipitation at geomagnetic latitudes beyond about L=10. In this study we report on large unexpectedly high-latitude D region ionization enhancements, detected by an incoherent scatter radar at L approximate to 16, which appear to be caused by electron precipitation from substorms. We go on to reexamine the latitudinal limits of substorm-produced EEP using data from multiple low-Earth orbiting spacecraft, and demonstrate that the precipitation stretches many hundreds of kilometers poleward of the previously suggested limits. We find that a typical substorm will produce significant EEP over the International Geomagnetic Reference Field L shell range L=4.60.2-14.51.2, peaking at L=6-7. However, there is significant variability from event to event; in contrast to the median case, the strongest 25% of substorms have significant EEP in the range spanning L=4.10.1-20.72.2, while the weakest 25% of substorms have significant EEP in the range spanning L=5.5 +/- 0.1-10.1 +/- 0.7. We also examine the occurrence probability of very large substorms, focusing on those events which appear to be able to disable geostationary satellites when they are located near midnight magnetic local time. On average, these large substorms occur approximately one to six times per year, a significant rate, given the potential impact on satellites.
引用
收藏
页码:6694 / 6705
页数:12
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