Search Publications
Interaction between reconnection and Kelvin-Helmholtz at the high-latitude magnetopause
Zhang, Hui; Ma, Xuanye; Otto, Antonius +1 more
On March 23, 2002, Cluster satellites recorded an event, which has been interpreted as reconnection, during an outward crossing near the dawn side cusp region in the Northern Hemisphere. The event showed a large perturbation in the magnetic normal component, inconsistent with a one-dimensional reconnection layer configuration, and causing a poor r…
Protoplanetary Disks in the Hostile Environment of Carina
Tsamis, Y. G.; Henney, W. J.; Mesa-Delgado, A. +2 more
We report the first direct imaging of protoplanetary disks in the star-forming region of Carina, the most distant massive cluster in which disks have been imaged. Using the Atacama Large Millimeter/sub-millimeter Array (ALMA), the disks are observed around two young stellar objects (YSOs) that are embedded inside evaporating gaseous globules and e…
Radio Pulsation Search and Imaging Study of SGR J1935+2154
Manoharan, P. K.; Surnis, Mayuresh. P.; Joshi, Bhal Chandra +3 more
We present the results obtained from imaging observations and a search for radio pulsations toward the magnetar SGR J1935+2154 made using the Giant Metrewave Radio Telescope and the Ooty Radio Telescope. We present the high-resolution radio image of the supernova remnant (SNR) G57.2+0.8, which is positionally associated with SGR J1935+2154. We did…
[C II] and [N II] from dense ionized regions in the Galaxy
Goldsmith, P. F.; Langer, W. D.; Pineda, J. L.
Context. The interstellar medium (ISM) consists of highly ionized and neutral atomic, as well as molecular, components. Knowledge of their distribution is important for tracing the structure and lifecycle of the ISM.
Aims: To determine the properties of the highly ionized gas and neutral weakly ionized gas in the Galaxy traced by the fine-str…
An Intense Flare-CME Event in 2015: Propagation and Interaction Effects Between the Sun and Earth's Orbit
Manoharan, P. K.; Johri, Abhishek
We report the interplanetary effects of a fast coronal mass ejection (CME) associated with the intense X2.7 flare that occurred on 05 May 2015. The near-Sun signatures of the CME at low-coronal heights [<2 R⊙] are obtained from the EUV images at 171 Å and metric radio observations. The intensity and duration of the CME-driven radio b…
Influence of intermittency on the anisotropy of magnetic structure functions of solar wind turbulence
He, Jiansen; Wang, Xin; Wang, Linghua +4 more
Intermittency appears to be connected with the spectral anisotropy of solar wind turbulence. We use the Local Intermittency Measure to identify and remove intermittency from the magnetic field data measured by the Ulysses spacecraft in fast solar wind. Structure functions are calculated based on the time sequences as obtained before and after remo…
A Data-driven Analytic Model for Proton Acceleration by Large-scale Solar Coronal Shocks
Schwadron, Nathan A.; Kozarev, Kamen A.
We have recently studied the development of an eruptive filament-driven, large-scale off-limb coronal bright front (OCBF) in the low solar corona, using remote observations from the Solar Dynamics Observatory’s Advanced Imaging Assembly EUV telescopes. In that study, we obtained high-temporal resolution estimates of the OCBF parameters regulating …
Jets, Coronal “Puffs,” and a Slow Coronal Mass Ejection Caused by an Opposite-polarity Region within an Active Region Footpoint
Morgan, H.; Alzate, N.
During a period of three days beginning 2013 January 17, twelve recurrent reconnection events occur within a small region of opposing flux embedded within one footpoint of an active region, accompanied by flares and jets observed in EUV and fast and faint structureless “puffs” observed by coronagraphs. During the same period a slow structured CME …
Martian surface microtexture from orbital CRISM multi-angular observations: A new perspective for the characterization of the geological processes
Schmidt, F.; Douté, S.; Fernando, J.
The surface of Mars has a high morphological and mineralogical diversity due to the intricacy of external, internal processes, and exchanges with the atmosphere, the hydrosphere and the cryosphere. In particular, liquid water played an important role in surface evolution. However, the origin, duration and intensity of those wet events have been hi…
3D pyCloudy modelling of bipolar planetary nebulae: Evidence for fast fading of the lobes
Morisset, C.; Zijlstra, A. A.; Gesicki, K.
Aims: The origin and evolution of the shapes of bipolar planetary nebulae are poorly understood. We postulate that their history can be traced through their internal velocity fields in a procedure similar to the one well established for spherical objects. Such an analysis requires 3D photoionization and kinematical modelling that is computati…