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Characteristics of ionospheric flux rope at the terminator observed by Venus Express
Zhang, T. L.; Chen, Y. Q.; Wang, G. Q. +1 more
We investigate the characteristics of the magnetic flux rope in the Venusian ionosphere near the terminator observed by the Venus Express while previous works about flux rope by PVO are mainly in the subsolar region. The probability to observe the flux rope becomes larger as solar activity strengthens. A statistical work during solar maximum prese…
Widespread exposure of Noachian phyllosilicates in the Margaritifer region of Mars: Implications for paleohydrology and astrobiological detection
Hynek, Brian M.; Thomas, Rebecca J.; Osterloo, Mikki M. +1 more
The best locations at which to detect evidence for early life on Mars are in materials formed in near-surface aqueous environments, particularly where this resulted in the deposition of minerals such as clays that are favorable to preservation of organics. The geological history of the Margaritifer region has resulted in exceptional potential to p…
Variable quiescent state for the neutron-star X-ray transient SAX J1750.8-2900: not such a hot neutron star after all?
Wijnands, R.; Parikh, A. S.
We monitored the neutron star low-mass X-ray binary SAX J1750.8-2900 after the end of its 2015/2016 outburst using the X-ray Telescope (XRT) aboard Swift to detect possible post-outburst 'rebrightenings', similar to those seen after its 2008 outburst. We did not detect any rebrightening behaviour, suggesting that the physical mechanism behind the …
Investigation of the Geoeffectiveness of Disk-Centre Full-Halo Coronal Mass Ejections
Valtonen, Eino; Ameri, Dheyaa
We studied the occurrence and characteristics of geomagnetic storms associated with disk-centre full-halo coronal mass ejections (DC-FH-CMEs). Such coronal mass ejections (CMEs) can be considered as the most plausible cause of geomagnetic storms. We selected front-side full-halo coronal mass ejections detected by the Large Angle and Spectrometric …
Dusty globules in the Crab Nebula
Gahm, G. F.; Grenman, T.; Elfgren, E.
Context. Dust grains are widespread in the Crab Nebula. A number of small, dusty globules, are visible as dark spots against the background of continuous synchrotron emission in optical images.
Aims: Our aim is to catalogue such dusty globules and investigate their properties.
Methods: From existing broad-band images obtained with the Hu…
Dawn Auroral Breakup at Saturn Initiated by Auroral Arcs: UVIS/Cassini Beginning of Grand Finale Phase
Badman, S. V.; Bonfond, B.; Gérard, J. -C. +4 more
We present Cassini auroral observations obtained on 11 November 2016 with the Ultraviolet Imaging Spectrograph at the beginning of the F-ring orbits and the Grand Finale phase of the mission. The spacecraft made a close approach to Saturn's southern pole and offered a remarkable view of the dayside and nightside aurora. With this sequence we ident…
Sparse Bayesian Inference and the Temperature Structure of the Solar Corona
Warren, Harry P.; Byers, Jeff M.; Crump, Nicholas A.
Measuring the temperature structure of the solar atmosphere is critical to understanding how it is heated to high temperatures. Unfortunately, the temperature of the upper atmosphere cannot be observed directly, but must be inferred from spectrally resolved observations of individual emission lines that span a wide range of temperatures. Such obse…
Characterization of Jupiter's secondary auroral oval and its response to hot plasma injections
Woodfield, E. E.; Gray, R. L.; Badman, S. V. +1 more
We present Jovian auroral observations from the 2014 January Hubble Space Telescope (HST) campaign and characterize the auroral second oval feature with particular attention to the response to hot plasma injections. The location of the second oval feature lies between the Ganymede and Europa moon footprint contours between 150 and 240° system III …
Further evidence for a quasar-driven jet impacting its neighbour galaxy: The saga of HE0450-2958 continues
Elbaz, D.; Sargent, M. T.; Papadopoulos, P. P. +2 more
HE0450-2958, an interacting quasar-starburst galaxy pair at z = 0.285, is one of the best-known examples of strong star formation activity in the presence of a quasar-driven jet. We present new multiband Karl G. Jansky Very Large Array-imaging covering 1-6 GHz and reaching an angular resolution of up to 0.6 arcsec (a sixfold improvement over exist…
Evidence for two-loop interaction from IRIS and SDO observations of penumbral brightenings
Patsourakos, S.; Nindos, A.; Alissandrakis, C. E. +1 more
Aims: We investigate small scale energy release events which can provide clues on the heating mechanism of the solar corona.
Methods: We analyzed spectral and imaging data from the Interface Region Imaging Spectrograph (IRIS), images from the Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatoty (SDO), and magnetograms…