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The Energetics of a Global Shock Wave in the Low Solar Corona
Gallagher, Peter T.; Long, David M.; Baker, Deborah +3 more
As the most energetic eruptions in the solar system, coronal mass ejections (CMEs) can produce shock waves at both their front and flanks as they erupt from the Sun into the heliosphere. However, the amount of energy produced in these eruptions, and the proportion of their energy required to produce the waves, is not well characterized. Here we us…
Revisiting the Local Leo Cold Cloud and Revised Constraints on the Local Hot Bubble
Peek, J. E. G.; Kuntz, K. D.; Snowden, S. L. +4 more
The Local Leo Cold Cloud (LLCC, at a distance of 11-24 pc) was studied in its relation to the Local Hot Bubble (LHB) and the result suggested that much of the observed 1/4 keV emission in that direction originates in front of the cloud. This placed a strong constraint on the distribution of X-ray emission within the LHB and called into question th…
Ensemble Modeling of Successive Halo CMEs: A Case Study
Arge, C. N.; Odstrcil, D.; Pizzo, V. +3 more
The Wang-Sheeley-Arge (WSA)-Enlil cone modeling system is used for making routine arrival-time forecasts of Earth-directed halo coronal mass ejections (CMEs), since they typically produce the most geoeffective events. A major objective of this work is to better understand the sensitivity of the WSA-Enlil modeling results to input model parameters …
Swift J1734.5-3027: a new long Type-I X-ray bursting source
Romano, P.; Ferrigno, C.; Papitto, A. +3 more
Swift J1734.5-3027 is a hard X-ray transient discovered by Swift while undergoing an outburst in September 2013. Archival observations showed that this source underwent a previous episode of enhanced X-ray activity in 2013 May-June. In this paper we report on the analysis of all X-ray data collected during the outburst in 2013 September, the first…
Multiple origins for olivine at Copernicus crater
Head, James W.; Dhingra, Deepak; Pieters, Carle M.
Multiple origins for olivine-bearing lithologies at Copernicus crater are recognized based on integrated analysis of data from Chandrayaan-1 Moon Mineralogy Mapper (M3), Lunar Reconnaissance Orbiter (LRO) Narrow Angle Camera (NAC) and Kaguya Terrain Camera (TC). We report the diverse morphological and spectral character of previously kn…
A large-scale anomaly in Enceladus' microwave emission
Janssen, Michael; Ries, Paul A.
The Cassini spacecraft flew by Enceladus on 6 November 2011, configured to acquire synthetic aperture RADAR imaging of most of the surface with the RADAR instrument. The pass also recorded microwave thermal emission from most of the surface. We report on global patterns of thermal emission at 2.17 cm based on this data set in the context of additi…
The Properties of the Tilts of Bipolar Solar Regions
Tlatov, A.; Illarionov, E.; Sokoloff, D.
We investigate various properties associated with the tilt of isolated magnetic bipoles in magnetograms taken at the solar surface. We show that bipoles can be divided into two groups that have tilts of opposite signs, and reveal similar properties with respect to bipole area, flux, and bipolar moment. Detailed comparison of these physical quantit…
A network of filaments detected by Herschel in the Serpens core. A laboratory to test simulations of low-mass star formation
Eiroa, C.; Burkert, A.; Testi, L. +6 more
Context. Filaments represent a key structure during the early stages of the star formation process. Simulations show that filamentary structures commonly formed before and during the formation of cores.
Aims: The Serpens core is an ideal laboratory for testing the state of the art of simulations of turbulent giant molecular clouds.
Metho…
Fast damping of ultralow frequency waves excited by interplanetary shocks in the magnetosphere
Zong, Qiugang; Rankin, Robert; Wang, Chengrui
Analysis of Cluster spacecraft data shows that intense ultralow frequency (ULF) waves in the inner magnetosphere can be excited by the impact of interplanetary shocks and solar wind dynamic pressure variations. The observations reveal that such waves can be damped away rapidly in a few tens of minutes. Here we examine mechanisms of ULF wave dampin…
Star Formation in High-redshift Cluster Ellipticals
Moustakas, John; Dey, Arjun; Alberts, Stacey +11 more
We measure the star formation rates (SFRs) of massive (M sstarf > 1010.1 M ⊙) early-type galaxies (ETGs) in a sample of 11 high-redshift (1.0 < z < 1.5) galaxy clusters drawn from the IRAC Shallow Cluster Survey (ISCS). We identify ETGs visually from Hubble Space Telescope imaging and select likely cluster…