Search Publications
Three-dimensional Simulations and Spacecraft Observations of Sub-ion Scale Turbulence in the Solar Wind: Influence of Landau Damping
Passot, T.; Sahraoui, F.; Henri, P. +5 more
Three-dimensional nonlinear finite Larmor radius (FLR)-Landau fluid simulations, which include some small-scale ({k}\perp {ρ }I≳ 1) kinetic effects, are performed to explore the nature of the sub-ion scale turbulence in the solar wind and to investigate the role of Landau damping and FLR corrections. The resulting steady-stat…
Magnetohydrodynamic Simulations for Studying Solar Flare Trigger Mechanism
Kusano, K.; Shiota, D.; Inoue, S. +1 more
In order to understand the flare trigger mechanism, we conduct three-dimensional magnetohydrodynamic simulations using a coronal magnetic field model derived from data observed by the Hinode satellite. Several types of magnetic bipoles are imposed into the photospheric boundary of the Nonlinear Force-free Field model of Active Region (AR) NOAA 109…
Discovery of the First Quadruple Gravitationally Lensed Quasar Candidate with Pan-STARRS
Keeton, C. R.; Berghea, C. T.; Dudik, R. P. +2 more
We report the serendipitous discovery of the first gravitationally lensed quasar candidate from Pan-STARRS. The grizy images reveal four point-like images with magnitudes between 14.9 and 18.1 mag. The colors of the point sources are similar, and they are more consistent with quasars than with stars or galaxies. The lensing galaxy is detected in t…
Global Energetics of Solar Flares. VI. Refined Energetics of Coronal Mass Ejections
Aschwanden, Markus J.
In this study, we refine the coronal mass ejection (CME) model that was presented in an earlier study of the global energetics of solar flares and associated CMEs and apply it to all (860) GOES M- and X-class flare events observed during the first seven years (2010-2016) of the Solar Dynamics Observatory (SDO) mission. The model refinements includ…
Hubble Space Telescope Imaging of the Active Dwarf Galaxy RGG 118
Greene, Jenny E.; Baldassare, Vivienne F.; Reines, Amy E. +1 more
RGG 118 (SDSS 1523+1145) is a nearby (z = 0.0243), dwarf disk galaxy ({M}* ≈ 2× {10}9 {M}⊙ ) that is found to host an active ∼50,000 solar mass black hole at its core. RGG 118 is one of a growing collective sample of dwarf galaxies known to contain active galactic nuclei (AGNs)—a group that, until recently, contain…
Sheath-accumulating Propagation of Interplanetary Coronal Mass Ejection
Shibata, Kazunari; Takahashi, Takuya
Fast interplanetary coronal mass ejections (ICMEs) are the drivers of strong space weather storms such as solar energetic particle events and geomagnetic storms. The connection between the space-weather-impacting solar wind disturbances associated with fast ICMEs at Earth and the characteristics of causative energetic CMEs observed near the Sun is…
Triggering Process of the X1.0 Three-ribbon Flare in the Great Active Region NOAA 12192
Kusano, Kanya; Shiota, Daikou; Inoue, Satoshi +1 more
The solar magnetic field in a flare-producing active region (AR) is much more complicated than theoretical models, which assume a very simple magnetic field structure. The X1.0 flare, which occurred in AR 12192 on 2014 October 25, showed a complicated three-ribbon structure. To clarify the trigger process of the flare and to evaluate the applicabi…
ALMA Observations of the Interaction of a Radio Jet with Molecular Gas in Minkowski's Object
Nyland, Kristina; Lacy, Mark; Croft, Steve +2 more
We use the Atacama Large Millimeter Array (ALMA) to detect and image CO (1-0) emission from Minkowski’s Object, a dwarf galaxy in the cluster Abell 194 that is interacting with a radio jet from a nearby elliptical galaxy. The ALMA observations, which are the first to detect molecular gas in Minkowski’s Object, also image the high-frequency continu…
A Potential Recoiling Supermassive Black Hole, CXO J101527.2+625911
Kim, D. -C.; Kim, Ji Hoon; Privon, G. C. +4 more
We have carried out a systematic search for recoiling supermassive black holes (rSMBH) using the Chandra Source and SDSS Cross-Match Catalog. From the survey, we have detected a potential rSMBH, CXO J101527.2+625911, at z = 0.3504. The source CXO J101527.2+625911 has a spatially offset (1.26 ± 0.05 kpc) active SMBH and kinematically offset broad e…
Characteristics that Produce White-light Enhancements in Solar Flares Observed by Hinode/SOT
Masuda, Satoshi; Watanabe, Kyoko; Kitagawa, Jun
To understand the conditions that produce white-light (WL) enhancements in solar flares, a statistical analysis of visible continuum data as observed by Hinode/Solar Optical Telescope (SOT) was performed. In this study, approximately 100 flare events from M- and X-class flares were selected. The time period during which the data were recorded span…