Abstract
In this study, three methods were used to analyze 17 large-scale local high-temperature regions with durations exceeding 2 h within magnetic clouds (MCs) observed by advanced composition explorer from 1998 to 2008. Results show that five of these large-scale regions may have been caused by flare heating; seven of the regions may have been caused by nonuniform expansion when MCs propagated in the solar-terrestrial space; four large-scale high temperature regions may likely result from combined non-uniform expansion and flare heating; and only one large-scale local high-temperature region was not related to either flare heating nor non-uniform expansion. No evidence indicated that magnetic reconnection occurred or had occurred within the high-temperature regions. Based on our results, we infer that such local high-temperature phenomena within MCs are caused primarily as a result of flare heating and non-uniform expansion, either separately or jointly, and that magnetic reconnection plays only a minor role in the formation of high-temperature regions.
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Acknowledgements
The authors would like to thank Dr. Jianfei TANG and Qiwu SONG for helpful discussion. This work was supported by the National Natural Science Foundation of China (Grant Nos. 41804162, 41674170 and 41974197).
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Wang, J., Feng, H., Li, H. et al. Local high-temperature phenomena within magnetic clouds. Sci. China Earth Sci. 64, 177–184 (2021). https://doi.org/10.1007/s11430-020-9669-5
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DOI: https://doi.org/10.1007/s11430-020-9669-5