Correlation length around Mars:A statistical study with MEX and MAVEN observations

作     者：Adriane Marques de Souza Franco Markus Franz Ezequiel Echer Mauricio JoséAlves Bolzan 

作者机构：National Institute for Space Research(INPE)Sao Jose dos CamposBrazil Max Planck Institute for Solar System ResearchGoettingenGermany Federal University of JataíJataíBrazil 

出 版 物：《Earth and Planetary Physics》 (地球与行星物理（英文版）)

年 卷 期：2019年第3卷第6期

页      面：560-569页

核心收录：

学科分类：07[理学] 

基　　金：FAPESP agency for support (projects 2016/10794-2 and 2017/00516-8) FAPESP (2018/21657-1) agencies supported by FAPEG (grant no. 201210267000905) CNPq (grants no. 302330/2015-1),CNPq (project CNPq/PQ 302583/20157) 

主　　题：Mars induced magnetosphere ULF waves correlation length 

摘      要：Correlation lengths of ultra-low-frequency(ULF)waves around Mars were computed for the first time,using data from MEX(electron density from 2004 to 2015)and MAVEN(electron density and magnetic field from 2014 to 2016).Analysis of the MEX data found that,for the frequency range 8 to 50 mHz,correlation length in electron density varied between 13 and 17 seconds(temporal scale)and between 5.5×10^3 km and 6.8×10^3 km(spatial scale).For the MAVEN time interval,correlation length was found to vary between 11 and 16 seconds(temporal scale)and 2×10^3–4.5×10^3 km in spatial *** the magnetic field data,correlation lengths are observed to be between 8–15 seconds(temporal scale)and between 1×10^3 and 5×10^3 km(spatial scale)over the same frequency *** observe that the cross sections of the plasma regions at the dayside of Mars are smaller than these correlation lengths in these regions in both analyses,where the correlation length derived from the MEX electron density data was between 5 and 25 times the size of the magnetosheath and the magnetic pile-up region(MPR),*** MAVEN these ratios are about 4(magnetosheath)and 11(MPR)in electron density and between 1.5 and 5.5 for magnetic field data,*** results indicate that waves at the magnetosheath/MPR can be related to oscillations in the upper *** a local region,wave trains may cause resonance effects at the planetary ionopause,which consequently contributes to the enhanced ion escape from the atmosphere.