Statistical Properties of Alfvén Ion Cyclotron Waves and Kinetic Alfvén Waves in the Inner Heliosphere  

作　　者：Chang Sun Lei Yang Qiu-Huan Li Cun-Li Dai Jian-Ping Li Zheng-Wei Cheng De-Jin Wu 

机构地区：[1]Key Laboratory of Planetary Sciences,Purple Mountain Observatory,CAS,Nanjing 210023,China [2]School of Astronomy and Space Sciences,University of Science and Technology of China,Hefei 230026,China [3]State Key Laboratory of Space Weather,National Space Science Center,CAS,Beijing 100190,China [4]Institute of Space Physics,Luoyang Normal University,Luoyang 471934,China [5]Henan Key Laboratory of Electromagnetic Transformation and Detection,Luoyang Normal University,Luoyang 471934,China [6]College of Sciences,Nanjing Agricultural University,Nanjing 210095,China [7]Key Laboratory of Dark Matter and Space Astronomy,Purple Mountain Observatory,CAS,Nanjing 210023,China

出　　处：《Research in Astronomy and Astrophysics》2023年第9期341-350,共10页天文和天体物理学研究（英文版）

基　　金：the National Natural Science Foundation of China(NSFC,grant Nos.41874201,12250014,11790302,42174195,and 11873018);the Specialized Research Fund for State Key Laboratories.

摘　　要：Alfvén ion cyclotron waves(ACWs)and kinetic Alfvén waves(KAWs)are found to exist at<0.3 au observed by Parker Solar Probe in Alfvénic slow solar winds.To examine the statistical properties of the background parameters for ACWs and KAWs and related wave disturbances,both wave events observed by Parker Solar Probe are selected and analyzed.The results show that there are obvious differences in the background and disturbance parameters between ACWs and KAWs.ACW events have a relatively higher occurrence rate but with a total duration slightly shorter than KAW events.The median background magnetic field magnitude and the related background solar wind speed of KAW events are larger than those of ACWs.The distributions of the relative disturbances of the proton velocity,proton temperature,the proton number density,andβcover wider ranges for ACW events than for KAW events.The results may be important for the understanding of the nature and characteristics of Alfvénic slow solar wind fluctuations at ion scales near the Sun,and provide the information of the background field and plasma parameters and the wave disturbances of ACWs and KAWs for further relevant theoretical modeling or numerical simulations.

关 键 词：(Sun )solar wind-plasmas-waves-methods STATISTICAL 

分 类 号：P182.2[天文地球—天文学]