Roth, Lorenz ORCID: 0000-0003-0554-4691, Boissier, Jeremie, Moullet, Arielle, Sanchez-Monge, Alvaro ORCID: 0000-0002-3078-9482, de Kleer, Katherine, Yoneda, Mizuki, Hikida, Reina, Kita, Hajime, Tsuchiya, Fuminori ORCID: 0000-0003-3386-6794, Blocker, Aljona ORCID: 0000-0001-9937-5950, Gladstone, G. Randall, Grodent, Denis, Ivchenko, Nickolay ORCID: 0000-0003-2422-5426, Lellouch, Emmanuel, Retherford, Kurt D., Saur, Joachim ORCID: 0000-0003-1413-1231, Schilke, Peter ORCID: 0000-0003-2141-5689, Strobel, Darrell and Thorwirth, Sven ORCID: 0000-0001-8200-6710 (2020). An attempt to detect transient changes in Io's SO2 and NaCl atmosphere. Icarus, 350. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1090-2643

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Abstract

Io's atmosphere is predominately SO2 that is sustained by a combination of volcanic outgassing and sublimation. The loss from the atmosphere is the main mass source for Jupiter's large magnetosphere. Numerous previous studies attributed various transient phenomena in Io's environment and Jupiter's magnetosphere to a sudden change in the mass loss from the atmosphere supposedly triggered by a change in volcanic activity. Since the gas in volcanic plumes does not escape directly, such causal correlation would require a transient volcano-induced change in atmospheric abundance, which has never been observed so far. Here we report four observations of atmospheric SO2 and NaCl from the same hemisphere of Io, obtained with the IRAM NOEMA interferometer on 11 December 2016, 14 March, 6 and 29 April 2017. These observations are compared to measurements of volcanic hot spots and Io's neutral and plasma environment. We find a stable NaCl column density in Io's atmosphere on the four dates. The SO2 column density derived for December 2016 is about 30% lower compared to the SO2 column density found in the period of March to April 2017. This increase in SO2 from December 2016 to March 2017 might be related to increasing volcanic activity observed at several sites in spring 2017, but the stability of the volcanic trace gas NaCl and resulting decrease in NaCl/SO2 ratio do not support this interpretation. Observed dimmings in both the sulfur ion torus and Na neutral cloud suggest rather a decrease in mass loading in the period of increasing SO2 abundance. The dimming Na brightness and stable atmospheric NaCl furthermore dispute an earlier suggested positive correlation of the sodium cloud and the hot spot activity at Loki Patara, which considerably increased in this period. The environment of Io overall appears to be in a rather quiescent state, preventing further conclusions. Only Jupiter's aurora morphology underwent several short-term changes, which are apparently unrelated to Io's quiescent environment or the relatively stable atmosphere.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Roth, LorenzUNSPECIFIEDorcid.org/0000-0003-0554-4691UNSPECIFIED
Boissier, JeremieUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moullet, ArielleUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sanchez-Monge, AlvaroUNSPECIFIEDorcid.org/0000-0002-3078-9482UNSPECIFIED
de Kleer, KatherineUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yoneda, MizukiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hikida, ReinaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kita, HajimeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tsuchiya, FuminoriUNSPECIFIEDorcid.org/0000-0003-3386-6794UNSPECIFIED
Blocker, AljonaUNSPECIFIEDorcid.org/0000-0001-9937-5950UNSPECIFIED
Gladstone, G. RandallUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grodent, DenisUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ivchenko, NickolayUNSPECIFIEDorcid.org/0000-0003-2422-5426UNSPECIFIED
Lellouch, EmmanuelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Retherford, Kurt D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Saur, JoachimUNSPECIFIEDorcid.org/0000-0003-1413-1231UNSPECIFIED
Schilke, PeterUNSPECIFIEDorcid.org/0000-0003-2141-5689UNSPECIFIED
Strobel, DarrellUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Thorwirth, SvenUNSPECIFIEDorcid.org/0000-0001-8200-6710UNSPECIFIED
URN: urn:nbn:de:hbz:38-313970
DOI: 10.1016/j.icarus.2020.113925
Journal or Publication Title: Icarus
Volume: 350
Date: 2020
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Place of Publication: SAN DIEGO
ISSN: 1090-2643
Language: English
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ADAPTIVE OPTICS OBSERVATIONS; HUBBLE-SPACE-TELESCOPE; NEUTRAL OXYGEN CLOUD; PLASMA TORUS; JUPITERS AURORA; ROVIBRONIC TRANSITION; SPATIAL-DISTRIBUTION; VOLCANIC ACTIVITY; 100 NIGHTS; EMISSIONMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/31397

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