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The Macronova in GRB 050709 and the GRB-macronova connection
Li, Xiang; Jin, Zhi-Ping; Covino, Stefano +6 more
GRB 050709 was the first short Gamma-ray Burst (sGRB) with an identified optical counterpart. Here we report a reanalysis of the publicly available data of this event and the discovery of a Li-Paczynski macronova/kilonova that dominates the optical/infrared signal at t>2.5 days. Such a signal would arise from 0.05 r-process material launched by…
Observing the release of twist by magnetic reconnection in a solar filament eruption
Zhang, Jun; Bi, Yi; Xue, Zhike +9 more
Magnetic reconnection is a fundamental process of topology change and energy release, taking place in plasmas on the Sun, in space, in astrophysical objects and in the laboratory. However, observational evidence has been relatively rare and typically only partial. Here we present evidence of fast reconnection in a solar filament eruption using hig…
Peak-ring structure and kinematics from a multi-disciplinary study of the Schrödinger impact basin
Kramer, Georgiana Y.; Collins, Gareth S.; Kring, David A. +2 more
The Schrödinger basin on the lunar farside is ~320 km in diameter and the best-preserved peak-ring basin of its size in the Earth-Moon system. Here we present spectral and photogeologic analyses of data from the Moon Mineralogy Mapper instrument on the Chandrayaan-1 spacecraft and the Lunar Reconnaissance Orbiter Camera (LROC) on the LRO spacecraf…
Earth's magnetosphere and outer radiation belt under sub-Alfvénic solar wind
Lugaz, Noé; Farrugia, Charles J.; Schwadron, Nathan A. +3 more
The interaction between Earth's magnetic field and the solar wind results in the formation of a collisionless bow shock 60,000-100,000 km upstream of our planet, as long as the solar wind fast magnetosonic Mach (hereafter Mach) number exceeds unity. Here, we present one of those extremely rare instances, when the solar wind Mach number reached ste…
An enduring rapidly moving storm as a guide to Saturn's Equatorial jet's complex structure
Hueso, R.; Sánchez-Lavega, A.; Rojas, J. F. +13 more
Saturn has an intense and broad eastward equatorial jet with a complex three-dimensional structure mixed with time variability. The equatorial region experiences strong seasonal insolation variations enhanced by ring shadowing, and three of the six known giant planetary-scale storms have developed in it. These factors make Saturn's equator a natur…