Magnetic reconnection as a possible heating mechanism of the local high temperature protons within magnetic clouds  

作　　者：FENG HengQiang WANG JieMin 

机构地区：[1]College of Physics and Electronics Science, Luoyang Normal University [2]State Key Laboratory of Space Weather, Center for Space Science and Applied Research,Chinese Academy of Sciences

出　　处：《Science China Earth Sciences》2014年第8期1979-1985,共7页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41074124,41274180,41231068);the Program for Science and Technology Innovation Research Team in University of Henan Province(Grant No.13IRTSTHN020);the Program for Science and Technology of Henan Province(Grant No.122300410331)

摘　　要：Magnetic clouds have the outstanding observational features of low proton temperature and plasma beta value, but numerous observations show that some magnetic clouds often have local high temperature phenomena. The local high temperature protons may be heated by magnetic reconnections within magnetic clouds. Here we take the magnetic cloud on 18–20 October 1995 as an example to discuss the possible heating mechanism. There is a famous protuberance in proton temperature between the front boundary and 11: 00 UT on 19 October 1995. Eight magnetic reconnection events were identified within the magnetic cloud, whose duration was less than 31 hours, and most of these reconnection events occurred within the proton temperature enhanced part of the magnetic cloud. Hence, it is possible for the local protons in the magnetic cloud to be heated by magnetic reconnections.Magnetic clouds have the outstanding observational features of low proton temperature and plasma beta value, but numerous observations show that some magnetic clouds often have local high temperature phenomena. The local high temperature protons may be heated by magnetic reconnections within magnetic clouds. Here we take the magnetic cloud on 18–20 October 1995 as an example to discuss the possible heating mechanism. There is a famous protuberance in proton temperature between the front boundary and 11： 00 UT on 19 October 1995. Eight magnetic reconnection events were identified within the magnetic cloud, whose duration was less than 31 hours, and most of these reconnection events occurred within the proton temperature enhanced part of the magnetic cloud. Hence, it is possible for the local protons in the magnetic cloud to be heated by magnetic reconnections.

关 键 词：magnetic cloud magnetic reconnection high temperature proton 

分 类 号：P353[天文地球—空间物理学]