Search Publications
A Semi-empirical Approach to the Dynamic Coupling of CMEs and Solar Wind
Riley, P.; Corona-Romero, P.; González-Avilés, J. J.
Coronal mass ejections (CMEs) are one of the most relevant phenomena for space weather. Moreover, CMEs can negatively affect essential services and facilities. Therefore, to protect society, we require well-grounded knowledge of the physics that governs the propagation of CMEs from near the Sun to the orbit of Earth. In this work, we deduce expres…
Magnetic Field Structure, Doppler Shift, and Intensity of Active Regions and Their Connections with the Solar Wind
Fu, Hui; Li, Bo; Xia, Lidong +4 more
The properties of active regions and their connections with the solar wind are important issues. In this study, nine isolated active regions near the solar disk center were chosen. The relationships between blueshift, intensity, magnetic concentrated areas (MCAs), and the potential-field source-surface (PFSS) open magnetic field of active regions …
Do All Low-Mass Stars Undergo Extra Mixing Processes?
Bania, T. M.; Balser, Dana S.; Wenger, Trey V.
Standard stellar evolution models that only consider convection as a physical process to mix material inside of stars predict the production of significant amounts of 3He in low-mass stars (M < 2 M ⊙), with peak abundances of 3He/H ~ few × 10-3 by number. Over the lifetime of the Galaxy, this ought to…
Using Computational Models to Uncover the Parameters of Three Kepler Binaries: KIC 5957123, KIC 8314879, and KIC 10727668
Odesse, Padraic E.; Lovekin, Catherine
Theories of stellar convective core overshoot can be examined through analysis of pulsating stars. Better accuracy can be achieved by obtaining external constraints such as those provided by observing pulsating stars in eclipsing binary systems, but this requires that the binary parameters be identified so photometric variations of the pulsating c…
Plasma Oscillations and Kinetic Instabilities at Ion Scales in the Expanding Magnetosheath
Trávníček, Pavel M.; Chaston, Chris C.
We investigate a relationship between a decaying spectrum of magnetic field perturbations and kinetic instabilities in a slowly expanding magnetosheath plasma using two-dimensional hybrid expanding simulations in (X, Y) space. We impose an initial ambient magnetic field B 0/B 0 = (1, 0, 0), and superimpose a flat spectrum of …
A Matched Survey for the Enigmatic Low Radio Frequency Transient ILT J225347+862146
Hallinan, Gregg; Sharma, Yashvi; Huang, Yuping +3 more
Discovered in 2011 with LOFAR, the 15 Jy low-frequency radio transient ILT J225347+862146 heralds a potentially prolific population of radio transients at <100 MHz. However, subsequent transient searches in similar parameter space yielded no detections. We test the hypothesis that these surveys at comparable sensitivity have missed the populati…
Determining the Spectral Content of MOSES Images
Kankelborg, Charles C.; Parker, Jacob D.
The Multi-Order Solar Extreme Ultraviolet Spectrograph (MOSES) sounding rocket was launched from White Sands Missile Range on 2006 February 8th, to capture images of the Sun in the He II 303.8 Å emission line. MOSES is a slitless spectrograph that forms images in multiple spectral orders simultaneously using a concave diffraction grating in an eff…
The Disk Population in a Distant Massive Protocluster
Tobin, John J.; Wang, Junfeng; Fedriani, Rubén +3 more
The unprecedented angular resolution and sensitivity of the Atacama Large Millimeter/submillimeter Array make it possible to unveil disk populations in distant (>2 kpc), embedded young cluster environments. We have conducted an observation toward the central region of the massive protocluster G286.21+0.16 at 1.3 mm. With a spatial resolution of…
The Electric Field outward of Saturn's Main Rings
Krupp, N.; Roussos, E.; Paranicas, C. +5 more
Cassini data are consistent with a global electric field in Saturn's magnetosphere that points approximately antisunward. The inner radial extent of this field was initially established using Saturn orbit insertion data but measurements of ultrarelativistic electrons from that pass cast some doubt on whether the electric field reaches all the way …
Line Profile Studies of Coronal Active Regions in Fe XII λ195.12 Using Hinode/EIS
Raju, K. P.; Prabhakar, Maya
Coronal active regions are studied using Hinode/EIS observations in the EUV line Fe XII λ195.12 by analyzing their line profiles from 2006 December to 2019 December. The period covers the last 2 yr of solar cycle 23 and solar cycle 24 fully. Active regions are the main source of magnetic field in the solar atmosphere, important in its heating and …