Ionospheric total electron content of comet 67P/Churyumov-Gerasimenko Rajkumar Hajra, Pierre Henri, Xavier Vallières, Marina Galand, Martin Rubin, Bruce T. Tsurutani, Nicolas Gilet, Luca Bucciantini and Zoltan Nemeth A&A, 635 (2020) A51 Published online: 06 March 2020 DOI: 10.1051/0004-6361/201937022