Analysis of Voyager 1 and Voyager 2 in situ CME observations

This paper studies ICMEs detected by both Voyager spacecraft during propagation from 1 to 10 AU, with observations from 1977 to 1980. ICMEs are detected by using several signatures in the in situ data, the primary one being the low measured to expected proton temperature ratio. We found 21 events common to both spacecraft and study their internal structure in terms of plasma and magnetic field properties. We find that ICMEs are expanding as they propagate outwards, with decreasing density and magnetic field intensities, in agreement with previous studies. We first carry out a statistical study and then a detailed analysis of each case. Furthermore, we analyse one case in which a shock can be clearly detected by both spacecraft. The methods described here can be interesting for other studies combining data sets from heliospheric missions. Furthermore, they highlight the importance of exploiting useful data from past missions. (c) 2022 COSPAR. Published by Elsevier B.V. All rights reserved.

Automated summary

This paper studies the ICMEs detected by Voyager spacecraft between 1977 and 1980 during their propagation from 1 to 10 AU. The study explores the internal structure of 21 common events detected by both spacecraft and analyzes their plasma and magnetic field properties. The results show that ICMEs expand as they propagate, with decreasing density and magnetic field intensities, consistent with previous studies. The methods described in this paper can be useful for studying other heliospheric missions and emphasize the importance of utilizing valuable data from past missions.