Search Publications
A Determination of the North-South Heliospheric Magnetic Field Component from Inner Corona Closed-loop Propagation
Jackson, B. V.; Buffington, A.; Hick, P. P. +4 more
A component of the magnetic field measured in situ near the Earth in the solar wind is present from north-south fields from the low solar corona. Using the Current-sheet Source Surface model, these fields can be extrapolated upward from near the solar surface to 1 AU. Global velocities inferred from a combination of interplanetary scintillation ob…
SWAP Observations of Post-flare Giant Arches in the Long-Duration 14 October 2014 Solar Eruption
West, Matthew J.; Seaton, Daniel B.
On 2014 October 14 the Sun Watcher with Active Pixels and Image Processing EUV solar telescope on board the Project for On Board Autonomy 2 spacecraft observed an eruption that led to the formation of perhaps the largest post-eruptive loop system seen in the solar corona in solar cycle 24. The initial eruption occurred at about 18:30 UT on October…
Testing Dark Matter Halo Models of Quasars with Thermal Sunyaev-Zeldovich Effect
Cen, Renyue; Safarzadeh, Mohammadtaher
A statistical analysis of stacked Compton-y maps of quasar hosts with a median redshift of 1.5 using Millennium Simulation is performed to address two issues: one on the feedback energy from quasars and the other on testing dark matter halo models for quasar hosts. On the first, we find that at the resolution of FWHM = 10 arcmin obtained by Planck…
When do stars in 47 Tucanae lose their mass?
Marigo, Paola; Richer, Harvey B.; Heyl, Jeremy +4 more
By examining the diffusion of young white dwarfs through the core of the globular cluster 47 Tucanae, we estimate the time when the progenitor star lost the bulk of its mass to become a white dwarf. According to stellar evolution models of the white-dwarf progenitors in 47 Tucanae, we find this epoch to coincide approximately with the star ascendi…
Magnetic Energy Dissipation during the 2014 March 29 Solar Flare
Aschwanden, Markus J.
We calculated the time evolution of the free magnetic energy during the 2014 March 29 flare (SOL2014 March 29T17:48), the first X-class flare detected by the Interface Region Imaging Spectrograph (IRIS). The free energy was calculated from the difference between the nonpotential field, constrained by the geometry of observed loop structures, and t…
Interchange Reconnection Forced by the Filament Eruption Inside a Pseudo-streamer
Yang, Jiayan; Bi, Yi; Hong, Junchao +2 more
We present rare observational signatures of interchange reconnection (IR) forced by the filament eruption inside a pseudo-streamer (PS). The PS was centered above a positive-polarity region bounded by two negative-polarity coronal holes (CHs), and thus its base contained two polarity inversion lines and a pair of loop arcades where two filaments w…
The Transient Accreting X-Ray Pulsar XTE J1946+274: Stability of X-Ray Properties at Low Flux and Updated Orbital Solution
Enoto, Teruaki; Terada, Yukikatsu; Hemphill, Paul B. +19 more
We present a timing and spectral analysis of the X-ray pulsar XTE J1946+274 observed with Suzaku during an outburst decline in 2010 October and compare with previous results. XTE J1946+274 is a transient X-ray binary consisting of a Be-type star and a neutron star with a 15.75 s pulse period in a 172 days orbit with 2-3 outbursts per orbit during …
Measuring an Eruptive Prominence at Large Distances from the Sun. I. Ionization and Early Evolution
Howard, T. A.
Measurements of Hα emission within an eruptive solar prominence are presented, using white light polarization properties as a proxy for the presence of Hα in the STEREO COR1 and COR2 coronagraphs. The transition from Hα emission to Thomson scattering radiance serves as an indicator of the ionization of the prominence, and I discuss the physical im…
Confirmation of Hostless Type Ia Supernovae Using Hubble Space Telescope Imaging
Zaritsky, D.; Sand, D. J.; Graham, M. L. +1 more
We present deep Hubble Space Telescope imaging at the locations of four, potentially hostless, long-faded Type Ia supernovae (SNe Ia) in low-redshift, rich galaxy clusters that were identified in the Multi-Epoch Nearby Cluster Survey. Assuming a steep faint-end slope for the galaxy cluster luminosity function ({α }d=-1.5), our data incl…
Evolution of the Far-infrared Cloud at Titan’s South Pole
Teanby, N. A.; de Kok, R.; Flasar, F. M. +17 more
A condensate cloud on Titan identified by its 220 cm-1 far-infrared signature continues to undergo seasonal changes at both the north and south poles. In the north, the cloud, which extends from 55 N to the pole, has been gradually decreasing in emission intensity since the beginning of the Cassini mission with a half-life of 3.8 years.…