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Global Energetics of Solar Flares. IV. Coronal Mass Ejection Energetics
Aschwanden, Markus J.
This study entails the fourth part of a global flare energetics project, in which the mass m cme, kinetic energy E kin, and the gravitational potential energy E grav of coronal mass ejections (CMEs) is measured in 399 M and X-class flare events observed during the first 3.5 years of the Solar Dynamics Observatory (…
On the Active Region Bright Grains Observed in the Transition Region Imaging Channels of IRIS
De Pontieu, B.; Rouppe van der Voort, L.; Skogsrud, H.
The Interface Region Imaging Spectrograph (IRIS) provides spectroscopy and narrow band slit-jaw (SJI) imaging of the solar chromosphere and transition region at unprecedented spatial and temporal resolutions. Combined with high-resolution context spectral imaging of the photosphere and chromosphere as provided by the Swedish 1 m Solar Telescope (S…
A comparative study of dipolarization fronts at MMS and Cluster
Russell, C. T.; Anderson, B. J.; Nakamura, R. +15 more
We present a statistical study of dipolarization fronts (DFs), using magnetic field data from MMS and Cluster, at radial distances below 12 RE and 20 RE, respectively. Assuming that the DFs have a semicircular cross section and are propelled by the magnetic tension force, we used multispacecraft observations to determine the …
Observation of the Evolution of a Current Sheet in a Solar Flare
Liu, Rui; Alexander, David; McAteer, R. T. James +1 more
We report multi-wavelength and multi-viewpoint observations of a solar eruptive event that involves loop-loop interactions. During a C2.0 flare, motions associated with inflowing and outflowing plasma provide evidence for ongoing magnetic reconnection. The flare loop top and a rising “concave-up” feature are connected by a current-sheet-like struc…
Modeling the Jovian magnetic field and its secular variation using all available magnetic field observations
Ridley, Victoria A.; Holme, Richard
We present new models of Jupiter's internal magnetic field and secular variation from all available direct measurements from three decades of spacecraft observation. A regularized minimum norm approach allows the creation of smooth, numerically stable models displaying a high degree of structure. External field from the magnetodisk is modeled iter…
Wavelength dependence of scattering properties in the VIS-NIR and links with grain-scale physical and compositional properties
Schmidt, F.; Ehlmann, B. L.; Pilorget, C. +2 more
Surface scattered sunlight carries important information about the composition and microtexture of surface materials, thus enabling tracing back the geological and climatic processes that occurred on the planetary body. Here we perform laboratory spectro-goniometric measurements of granular samples (45-75 µ m fraction) with different composi…
A spectral line list for water isotopologues in the 1100-4100 cm-1 region for application to CO2-rich planetary atmospheres
Gamache, Robert R.; Farese, Michaella; Renaud, Candice L.
A line list of transitions for seven isotopologues of water vapor in the 1100-4100 wavenumber range has been constructed for application to atmospheres rich in CO2. The quantum transitions for H216O, H218O, H217O, HD16O, HD18O, and HD17O a…
Fragmentation Kinematics in Comet 332P/Ikeya-Murakami
Mutchler, Max; Jewitt, David; Weryk, Robert +9 more
We present initial time-resolved observations of the split comet 332P/Ikeya-Murakami taken using the Hubble Space Telescope. Our images reveal a dust-bathed cluster of fragments receding from their parent nucleus at projected speeds in the range 0.06-3.5 m s-1 from which we estimate ejection times from 2015 October to December. The numb…
Pulsation-triggered Mass Loss from AGB Stars: The 60 Day Critical Period
Zijlstra, A. A.; McDonald, I.
Low- and intermediate-mass stars eject much of their mass during the late, red giant branch (RGB) phase of evolution. The physics of their strong stellar winds is still poorly understood. In the standard model, stellar pulsations extend the atmosphere, allowing a wind to be driven through radiation pressure on condensing dust particles. Here, we i…
High-redshift supernova rates measured with the gravitational telescope A 1689
Dahle, H.; Lidman, C.; Amanullah, R. +12 more
Aims: We present a ground-based, near-infrared search for lensed supernovae behind the massive cluster Abell 1689 at z = 0.18, which is one of the most powerful gravitational telescopes that nature provides.
Methods: Our survey was based on multi-epoch J-band observations with the HAWK-I instrument on VLT, with supporting optical data fr…