Search Publications
First in situ evidence of electron pitch angle scattering due to magnetic field line curvature in the Ion diffusion region
Lavraud, B.; Liu, Z. X.; Rong, Z. J. +8 more
Theory predicts that the first adiabatic invariant of a charged particle may be violated in a region of highly curved field lines, leading to significant pitch angle scattering for particles whose gyroradius are comparable to the radius of the magnetic field line curvature. This scattering generates more isotropic particle distribution functions, …
Star formation and AGN activity in the most luminous LINERs in the local universe
Pérez, Enrique; Netzer, Hagai; Pović, Mirjana +4 more
This work presents the properties of 42 objects in the group of the most luminous, highest star formation rate (SFR) low-ionization nuclear emission-line regions (LINERs) at z = 0.04-0.11. We obtained long-slit spectroscopy of the nuclear regions for all sources, and FIR data (Herschel and IRAS) for 13 of them. We measured emission-line intensitie…
Analysis of Flows inside Quiescent Prominences as Captured by Hinode/Solar Optical Telescope
Longcope, D. W.; McKenzie, D. E.; Freed, M. S. +1 more
Developing an understanding of how magnetic fields can become entangled in a prominence is important for predicting a possible eruption. This work investigates the kinetic energy and vorticity associated with plasma motion residing inside quiescent prominences (QPs). These plasma flow characteristics can be utilized to improve our understanding of…
Association of 3He-Rich Solar Energetic Particles with Large-scale Coronal Waves
Mason, Glenn M.; Bučík, Radoslav; Wiedenbeck, Mark E. +1 more
Small, 3He-rich solar energetic particle (SEP) events have been commonly associated with extreme-ultraviolet (EUV) jets and narrow coronal mass ejections (CMEs) that are believed to be the signatures of magnetic reconnection, involving field lines open to interplanetary space. The elemental and isotopic fractionation in these events are…
Relationship Between Chromospheric Evaporation and Magnetic Field Topology in an M-Class Solar Flare
Kosovichev, Alexander G.; Sadykov, Viacheslav M.; Sharykin, Ivan N. +2 more
Chromospheric evaporation is observed as Doppler blueshift during solar flares. It plays a key role in the dynamics and energetics of solar flares; however, its mechanism is still unknown. In this paper, we present a detailed analysis of spatially resolved multi-wavelength observations of chromospheric evaporation during an M 1.0-class solar flare…
Models of the η Corvi Debris Disk from the Keck Interferometer, Spitzer, and Herschel
Bryden, G.; Lebreton, J.; Boccaletti, A. +4 more
Debris disks are signposts of analogs to small-body populations of the solar system, often, however, with much higher masses and dust production rates. The disk associated with the nearby star η Crv is especially striking, as it shows strong mid- and far-infrared excesses despite an age of ∼1.4 Gyr. We undertake constructing a consistent model of …
ZFIRE: The Kinematics of Star-forming Galaxies as a Function of Environment at z ∼ 2
Kewley, Lisa J.; Allen, Rebecca J.; Kacprzak, Glenn G. +12 more
We perform a kinematic analysis of galaxies at z ∼ 2 in the COSMOS legacy field using near-infrared (NIR) spectroscopy from Keck/MOSFIRE as part of the ZFIRE survey. Our sample consists of 75 Ks-band selected star-forming galaxies from the ZFOURGE survey with stellar masses ranging from log(M ⋆/M ⊙) = 9.0-11.0, 28 of which ar…
Commentary on accessing 3-D currents in space: Experiences from Cluster
Dunlop, M. W.; Haaland, S.; Dong, X. -C. +1 more
The curlometer was introduced to estimate the electric current density from four-point measurements in space; anticipating the realization of the four spacecraft Cluster mission which began full science operations in February 2001. The method uses Ampère's law to estimate current from the magnetic field measurements, suitable for the high-conducti…
How Janus' orbital swap affects the edge of Saturn's A ring?
Nicholson, Philip D.; French, Richard G.; Hedman, Matthew M. +6 more
We present a study of the behavior of Saturn's A ring outer edge, using images and occultation data obtained by the Cassini spacecraft over a period of 8 years from 2006 to 2014. More than 5000 images and 170 occultations of the A ring outer edge are analyzed. Our fits confirm the expected response to the Janus 7:6 Inner Lindblad resonance (ILR) b…
Probing a panoply of curvaton-decay scenarios using CMB data
Grin, Daniel; Smith, Tristan L.
In the curvaton scenario, primordial curvature perturbations are produced by a second field that is subdominant during inflation. Depending on how the curvaton decays [possibly producing baryon number, lepton number, or cold dark matter (CDM)], mixtures of correlated isocurvature perturbations are produced, allowing the curvaton scenario to be tes…