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LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00004644naa a2200421 4500
001oai:DiVA.org:uu-387257
003SwePub
008190626s2018 | |||||||||||000 ||eng|
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3872572 URI
0247 a https://doi.org/10.1029/2018GL0791502 DOI
040 a (SwePub)uu
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Hadid, Lina Zu Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen4 aut0 (Swepub:uu)linha848
2451 0a Ring Shadowing Effects on Saturn's Ionosphere :b Implications for Ring Opacity and Plasma Transport
264 1b AMER GEOPHYSICAL UNION,c 2018
338 a print2 rdacarrier
520 a We present new results obtained by the Radio and Plasma Wave Science Langmuir probe on board Cassini during the Grand Finale. The total direct current sampled by the Langmuir probe at negative bias voltage is used to study the effect of the ring shadows on the structure of the Kronian topside ionosphere. The D and C rings and the Cassini Division are confirmed to be optically thin to extreme ultraviolet solar radiation. However, different responses from the opaque A and B rings are observed. The edges of the A ring shadow are shown to match the A ring boundaries, unlike the B ring, which indicates variable responses to the B ring shadow. We show that the variable responses are due to the ionospheric plasma, more precisely to the longer chemical lifetime of H+ compared to H-2(+) and H-3(+), suggesting that the plasma is transported from the sunlit region to the shadowed one in the ionosphere. Plain Language Summary As Saturn's northern hemisphere experienced summer during the Grand Finale, the planet's northern dayside hemisphere and its rings were fully illuminated by the Sun. However, the southern hemisphere was partly obscured because of the shadows cast by the A and B rings. Using the in situ measurements of the Langmuir probe part of the Radio and Plasma Wave Science investigation on board the Cassini spacecraft, we study for the first time the effect of the ring shadows on Saturn's ionosphere. From the ring shadows signatures on the total ion current collected by the Langmuir probe, we show that the A and B rings are optically thicker (to the solar extreme ultraviolet radiation) than the inner C and D rings and the Cassini Division to the solar extreme ultraviolet radiation. Moreover, we reproduce the boundaries of the A ring and the outer edge of the B ring. Furthermore, observed variations with respect to the inner edge of the B ring imply a delayed response of the ionospheric H+ because of its long lifetime and suggest that the ionospheric plasma is transported from an unshadowed region to a shadowed one in the ionosphere.
650 7a NATURVETENSKAPx Fysikx Fusion, plasma och rymdfysik0 (SwePub)103032 hsv//swe
650 7a NATURAL SCIENCESx Physical Sciencesx Fusion, Plasma and Space Physics0 (SwePub)103032 hsv//eng
7001 a Morooka, Michiko W.u Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen4 aut0 (Swepub:uu)mimor108
7001 a Wahlund, Jan-Eriku Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen4 aut0 (Swepub:uu)janewahl
7001 a Moore, L.u Boston Univ, Ctr Space Phys, Boston, MA 02215 USA4 aut
7001 a Cravens, T. E.u Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA4 aut
7001 a Hedman, M. M.u Univ Idaho, Dept Phys, Moscow, ID USA4 aut
7001 a Edberg, Niklas J. T.u Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen4 aut0 (Swepub:uu)niked861
7001 a Vigren, Eriku Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen4 aut0 (Swepub:uu)erivi300
7001 a Waite, J. H., Jr.u Southwest Res Inst, Space Sci & Engn Div, San Antonio, TX USA4 aut
7001 a Perryman, R.u Southwest Res Inst, Space Sci & Engn Div, San Antonio, TX USA4 aut
7001 a Kurth, W. S.u Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA4 aut
7001 a Farrell, W. M.u NASA, Goddard Space Flight Ctr, Greenbelt, MD USA4 aut
7001 a Eriksson, Anders I.u Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen4 aut0 (Swepub:uu)andeerik
7102 a Uppsala universitetb Institutet för rymdfysik, Uppsalaavdelningen4 org
7730 t Geophysical Research Lettersd : AMER GEOPHYSICAL UNIONg 45:19, s. 10084-10092q 45:19<10084-10092x 0094-8276x 1944-8007
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-387257
8564 8u https://doi.org/10.1029/2018GL079150

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