Rights statement: ©2014. The Authors.
Final published version, 2.79 MB, PDF document
Available under license: CC BY-NC-ND
Final published version
Licence: CC BY-NC-ND
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Cusp observation at Saturn's high-latitude magnetosphere by the Cassini spacecraft
AU - Jasinski, J. M.
AU - Arridge, C. S.
AU - Lamy, L.
AU - Leisner, J. S.
AU - Thomsen, M. F.
AU - Mitchell, Donald G.
AU - Coates, A. J.
AU - Radioti, A.
AU - Jones, Geraint H.
AU - Roussos, E.
AU - Krupp, N.
AU - Grodent, D.
AU - Dougherty, M. K.
AU - Waite, J. H.
N1 - ©2014. The Authors.
PY - 2014/3/16
Y1 - 2014/3/16
N2 - We report on the first analysis of magnetospheric cusp observations at Saturn by multiple in situ instruments onboard the Cassini spacecraft. Using this we infer the process of reconnection was occurring at Saturn's magnetopause. This agrees with remote observations that showed the associated auroral signatures of reconnection. Cassini crossed the northern cusp around noon local time along a poleward trajectory. The spacecraft observed ion energy-latitude dispersionsa characteristic signature of the terrestrial cusp. This ion dispersion is stepped, which shows that the reconnection is pulsed. The ion energy-pitch angle dispersions suggest that the field-aligned distance from the cusp to the reconnection site varies between approximate to 27 and 51 R-S. An intensification of lower frequencies of the Saturn kilometric radiation emissions suggests the prior arrival of a solar wind shock front, compressing the magnetosphere and providing more favorable conditions for magnetopause reconnection.Key PointsWe observe evidence for reconnection in the cusp plasma at Saturn We present evidence that the reconnection process can be pulsed at Saturn Saturn's cusp shows similar characteristics to the terrestrial cusp
AB - We report on the first analysis of magnetospheric cusp observations at Saturn by multiple in situ instruments onboard the Cassini spacecraft. Using this we infer the process of reconnection was occurring at Saturn's magnetopause. This agrees with remote observations that showed the associated auroral signatures of reconnection. Cassini crossed the northern cusp around noon local time along a poleward trajectory. The spacecraft observed ion energy-latitude dispersionsa characteristic signature of the terrestrial cusp. This ion dispersion is stepped, which shows that the reconnection is pulsed. The ion energy-pitch angle dispersions suggest that the field-aligned distance from the cusp to the reconnection site varies between approximate to 27 and 51 R-S. An intensification of lower frequencies of the Saturn kilometric radiation emissions suggests the prior arrival of a solar wind shock front, compressing the magnetosphere and providing more favorable conditions for magnetopause reconnection.Key PointsWe observe evidence for reconnection in the cusp plasma at Saturn We present evidence that the reconnection process can be pulsed at Saturn Saturn's cusp shows similar characteristics to the terrestrial cusp
KW - cusp
KW - reconnection
KW - plasma
KW - dispersion
KW - Cassini
KW - SOLAR-WIND
KW - KILOMETRIC RADIATION
KW - POLAR CUSP
KW - MAGNETOPAUSE
KW - RECONNECTION
KW - DYNAMICS
KW - ROTATION
U2 - 10.1002/2014GL059319
DO - 10.1002/2014GL059319
M3 - Journal article
VL - 41
SP - 1382
EP - 1388
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 5
ER -