학술논문
Detection of magnetospheric ion drift patterns at Mars
Document Type
Working Paper
Author
Zhang, Chi; Nilsson, Hans; Ebihara, Yusuke; Yamauchi, Masatoshi; Persson, Moa; Rong, Zhaojin; Zhong, Jun; Dong, Chuanfei; Chen, Yuxi; Zhou, Xuzhi; Sun, Yixin; Harada, Yuki; Halekas, Jasper; Xu, Shaosui; Futaana, Yoshifumi; Shi, Zhen; Yuan, Chongjing; Yun, Xiaotong; Fu, Song; Gao, Jiawei; Holmström, Mats; Wei, Yong; Barabash, Stas
Source
Subject
Language
Abstract
Mars lacks a global magnetic field, and instead possesses small-scale crustal magnetic fields, making its magnetic environment fundamentally different from intrinsic magnetospheres like those of Earth or Saturn. Here we report the discovery of magnetospheric ion drift patterns, typical of intrinsic magnetospheres, at Mars usingmeasurements fromMarsAtmosphere and Volatile EvolutioNmission. Specifically, we observewedge-like dispersion structures of hydrogen ions exhibiting butterfly-shaped distributions within the Martian crustal fields, a feature previously observed only in planetary-scale intrinsic magnetospheres. These dispersed structures are the results of driftmotions that fundamentally resemble those observed in intrinsic magnetospheres. Our findings indicate that the Martian magnetosphere embodies an intermediate case where both the unmagnetized and magnetized ion behaviors could be observed because of the wide range of strengths and spatial scales of the crustal magnetic fields around Mars.
Comment: 10 pages, 6 figures
Comment: 10 pages, 6 figures