Search Publications
Observational Signatures of a Kink-unstable Coronal Flux Rope Using Hinode/EIS
Young, P. R.; Régnier, S.; Verwichte, E. +3 more
The signatures of energy release and energy transport for a kink-unstable coronal flux rope are investigated via forward modeling. Synthetic intensity and Doppler maps are generated from a 3D numerical simulation. The CHIANTI database is used to compute intensities for three Hinode/EIS emission lines that cover the thermal range of the loop. The i…
The InterPlanetary Network Supplement to the Second Fermi GBM Catalog of Cosmic Gamma-Ray Bursts
Zhang, X.; Cline, T.; Hurley, K. +32 more
InterPlanetary Network (IPN) data are presented for the gamma-ray bursts in the second Fermi Gamma-Ray Burst Monitor (GBM) catalog. Of the 462 bursts in that catalog between 2010 July 12 and 2012 July 11, 428, or 93%, were observed by at least 1 other instrument in the 9-spacecraft IPN. Of the 428, the localizations of 165 could be improved by tri…
High Dense Gas Fraction in a Gas-rich Star-forming Galaxy at z = 1.2
Carilli, Chris; Daddi, Emanuele; Dannerbauer, Helmut +3 more
We report observations of dense molecular gas in the star-forming galaxy EGS 13004291 (z = 1.197) using the Plateau de Bure Interferometer. We tentatively detect HCN and HNC J=2\to 1 emission when stacked together at 4σ significance, yielding line luminosities of {L}HCN(J=2\to 1)}\prime =(9+/- 3)× {10}9 K km s…
Development of a Marslander with crushable shock absorber by virtual and experimental testing
Reinhardt, B.; Schröder, Silvio; Brauner, C. +2 more
Since the beginning of space exploration, probes have been sent to other planets or moons with the associated challenge of landing on these bodies. For a soft landing several damping methods like landing legs or airbags have been used. A new and potentially less complex and lighter way to reduce the shock loads at touchdown is the use of a crushab…
How to co-add images? I. A new iterative method for image reconstruction of dithered observations
Wang, Lei; Li, Guo-Liang
By employing the previous Voronoi approach and replacing its nearest neighbor approximation with Drizzle in iterative signal extraction, we develop a fast iterative Drizzle algorithm, named fiDrizzle, to reconstruct the underlying band-limited image from undersampled dithered frames. Compared with the existing iDrizzle, the new algorithm improves …
Propagation of Coronal Mass Ejections Observed During the Rising Phase of Solar Cycle 24
Shanmugaraju, A.; Syed Ibrahim, M.; Manoharan, P. K.
In this study, we investigate the interplanetary consequences and travel time details of 58 coronal mass ejections (CMEs) in the Sun-Earth distance. The CMEs considered are halo and partial halo events of width >120 °. These CMEs occurred during 2009 - 2013, in the ascending phase of the Solar Cycle 24. Moreover, they are Earth-directed events …
Ultraviolet spectroscopy of the blue supergiant SBW1: the remarkably weak wind of a SN 1987A analogue
Smith, Nathan; France, Kevin; Groh, Jose H. +1 more
The Galactic blue supergiant SBW1 with its circumstellar ring nebula represents the best known analogue of the progenitor of SN 1987A. High-resolution imaging has shown Hα and infrared structures arising in an ionized flow that partly fills the ring's interior. To constrain the influence of the stellar wind on this structure, we obtained an ultrav…
Saturn's rings and associated ring plasma cavity: Evidence for slow ring erosion
Gurnett, D. A.; Persoon, A. M.; Kurth, W. S. +2 more
We re-examine the radio and plasma wave observations obtained during the Cassini Saturn orbit insertion period, as the spacecraft flew over the northern ring surface into a radial distance of 1.3 Rs (over the C-ring). Voyager era studies suggest the rings are a source of micro-meteoroid generated plasma and dust, with theorized peak imp…
Snow carrots after the Chelyabinsk event and model implications for highly porous solar system objects
Luther, Robert; Wünnemann, Kai; Artemieva, Natalia +2 more
After the catastrophic disruption of the Chelyabinsk meteoroid, small fragments formed funnels in the snow layer covering the ground. We constrain the pre-impact characteristics of the fragments by simulating their atmospheric descent with the atmospheric entry model. Fragments resulting from catastrophic breakup may lose about 90% of their initia…
Whistler mode waves upstream of Saturn
Gurnett, D. A.; Dougherty, M. K.; Kurth, W. S. +3 more
Whistler mode waves are generated within and can propagate upstream of collisionless shocks. They are known to play a role in electron thermodynamics/acceleration and, under certain conditions, are markedly observed as wave trains preceding the shock ramp. In this paper, we take advantage of Cassini's presence at 10 AU to explore the importance of…