Search Publications
Missions
Journals
Publication Years
Simultaneous multi-spacecraft observations with VLBI radio telescopes to study the interplanetary phase scintillation
Molera Calvés, G.; Kummamuru, P.; Edwards, J. +3 more
Ground-based observations of spacecraft signals have been used to study space weather. However, single spacecraft measurements observed from the Earth have limitations in studying the structure and evolution of solar plasma as they are unable to differentiate spatial and temporal variations. To overcome this limitation and improve our understandin…
Simultaneous Existence of Oscillations, Counterstreaming Flows, and Mass Injections in Solar Quiescent Prominences
Xu, Zhe; Xue, Zhike; Yan, Xiaoli +8 more
Solar prominences are very spectacular structures embedded in the tenuous and hot solar corona. Counterstreaming flows, a common feature in solar quiescent prominences, have been discovered for more than 20 yr. However, the mechanism driving the counterstreaming flows is still elusive. To unveil the nature of this phenomenon, we analyzed data of a…
A Candidate High-velocity Exoplanet System in the Galactic Bulge
Lu, Jessica R.; Cole, Andrew A.; Beaulieu, Jean-Philippe +11 more
We present an analysis of adaptive optics images from the Keck I telescope of the microlensing event MOA-2011-BLG-262. The original discovery paper by Bennett et al. reports two possibilities for the lens system: a nearby gas giant lens with an exomoon companion or a very low-mass star with a planetary companion in the Galactic bulge. The ∼10 yr b…
X-Ray Emission Properties of a Compact Symmetric Object Sample
Yao, Su; Zhang, Hai-Ming; Zhang, Jin +2 more
We present a comprehensive analysis of the X-ray observations obtained from XMM-Newton and Chandra for a sample of bona-fide Compact Symmetric Objects (CSOs) to investigate their X-ray emission properties. Ultimately, we obtain 32 effective X-ray observational spectra from 17 CSOs. Most spectra can be well described by an absorbed single power-law…
The Hottest Neptunes Orbit Metal-rich Stars
Behmard, Aida; Vissapragada, Shreyas
The Neptune desert is no longer empty. A handful of close-in planets with masses between those of Neptune and Saturn have now been discovered, and their puzzling properties have inspired a number of interesting theories on the formation and evolution of desert-dwellers. While some studies suggest that Neptune desert planets form and evolve similar…
On the Magnetic and Thermodynamic Properties of Dark Fibrils in the Chromosphere
Kriginsky, Matheus; Oliver, Ramon
Fibrillar structures are ubiquitous in the solar chromosphere. An accurate determination of their properties requires the use of advanced high-resolution observations, which are now becoming broadly available from different observatories. We exploit the capabilities of multi-atom, multiline spectropolarimetric inversions using the Stockholm Invers…
Constraining Solar Wind Transport Model Parameters Using Bayesian Analysis
Parashar, Tulasi N.; Oughton, Sean; Bishop, Mark A. +1 more
We apply nested-sampling Bayesian analysis to a model for the transport of magnetohydrodynamic-scale solar wind fluctuations. The dual objectives are to obtain improved constraints on parameters present in the turbulence transport model (TTM) and to support quantitative comparisons of the quality of distinct versions of the transport model. The TT…
A New X-Ray and Radio Burst Activity from the Magnetar SGR 1935+2154
Ibrahim, Alaa I.; Rehan, Noor S.
SGR 1935+2154 has emerged as the most active magnetar in recent years, exhibiting X-ray burst activity nearly annually and emitting a fast radio burst (FRB 200428 (FRB1)) in its 2020 April activity, for the first time from a Milky Way source, accompanied by an X-ray burst (XFRB1). The source was active again in 2021 September and 2022 J…
Martian Chaos terrain fracture geometry indicates drainage and compaction of laterally heterogeneous confined aquifers
Levy, Joseph S.; Subak, Thomas F.; Armstrong, Ian +7 more
The interlocking plateaus of martian chaotic terrain have long been inferred to relate to Hesperian outflow-channel megafloods. Numerous hypotheses have been invoked to explain the formation of the hundreds-of-kilometer-scale depressions that chaoses are found in, and the mechanisms by which the fractures formed. Hypotheses range from mechanisms i…
Elemental Abundances at Coronal Hole Boundaries as a Means to Investigate Interchange Reconnection and the Solar Wind
Koukras, Alexandros; Savin, Daniel W.; Hahn, Michael
The origin of the slow solar wind is not well understood, unlike the fast solar wind that originates from coronal holes. In situ elemental abundances of the slow solar wind suggest that it originates from initially closed field lines that become open. Coronal hole boundary regions are a potential source of slow solar wind, as open field lines ther…