Inner southern magnetosphere observation of Mercury via SERENA ion sensors in BepiColombo mission

S Orsini*, Anna Milillo, Herbert I M Lichtenegger, Ali Varsani, Stas Barabash, S. Livi, Enrico De Angelis, Tommaso Alberti, G. Laky, H. Nilsson, M Phillips, Alessandro Aronica, Esa Kallio, Peter Wurz, Angelo Olivieri, Christina Plainaki, James A. Slavin, Iannis Dandouras, J. M. Raines, Johannes BenkhoffJ. Zender, J. -J. Berthelier, Melinda Dósa, G. Ho, R. M. Killen, S. McKenna-Lawlor, K Torkar, O. Vaisberg, Frederic A. Allegrini, I. A. Daglis, Chuanfei Dong, C. P. Escoubet, S. Fatemi, Markus Fränz, S. L. Ivanovski, N. Krupp, H. Lammer, François Leblanc, Valeria Mangano, A. Mura, R. Rispoli, M. Sarantos, H. T. Smith, Martin Wieser, F. Camozzi, A. M. Di Lellis, G. Fremuth, F. Giner, R. Gurnee, J. Hayes, H. Jeszenszky, Bradley Trantham, Jan Balaz, Wolfgang Baumjohann, M. Cantatore, D. Delcourt, M. Delva, M. Desai, Henning Fischer, A. Galli, Manuel Grande, Mats Holmström, I. Horvath, Kechiang Hsieh, Riku Järvinen, R. E. Johnson, A. Kazakov, K. Kecskemety, H. Krüger, C. Kürbisch, Frederic Leblanc, M. Leichtfried, E Mangraviti, Stefano Massetti, D. Moissenko, M Moroni, R. Noschese, F. Nuccilli, N. Paschalidis, J. Ryno, K. Seki, A. Shestakov, S. Shuvalov, R. Sordini, F Stenbeck, J. Svensson, Sandor Szalai, K. Szego, D. Toublanc, N. Vertolli, R. Wallner, A Vorburger

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Mercury’s southern inner magnetosphere is an unexplored region as it was not observed by earlier space missions. In October 2021, BepiColombo mission has passed through this region during its first Mercury flyby. Here, we describe the observations of SERENA ion sensors nearby and inside Mercury’s magnetosphere. An intermittent high-energy signal, possibly due to an interplanetary magnetic flux rope, has been observed downstream Mercury, together with low energy solar wind. Low energy ions, possibly due to satellite outgassing, were detected outside the magnetosphere. The dayside magnetopause and bow-shock crossing were much closer to the planet than expected, signature of a highly eroded magnetosphere. Different ion populations have been observed inside the magnetosphere, like low latitude boundary layer at magnetopause inbound and partial ring current at dawn close to the planet. These observations are important for understanding the weak magnetosphere behavior so close to the Sun, revealing details never reached before.

Original languageEnglish
Article number7390
JournalNature Communications
Volume13
Issue number1
DOIs
Publication statusPublished - Dec 2022
MoE publication typeA1 Journal article-refereed

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