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North/South Hemispheric Periodicities in the {>} 25 MeV Solar Proton Event Rate During the Rising and Peak Phases of Solar Cycle 24
Cane, H. V.; Richardson, I. G.; von Rosenvinge, T. T.
We present evidence that >25 MeV solar proton events show a clustering in time at intervals of about six months that persisted during the rising and peak phases of Solar Cycle 24. This phenomenon is most clearly demonstrated by considering events originating in the northern or southern solar hemispheres separately. We examine how these variatio…
From the LIR-T Relation to the Limited Sizes of Dusty Starbursting Regions at High Redshifts
Yan, Haojing; Ma, Zhiyuan
Using the far-infrared (IR) data obtained by the Herschel Space Observatory, we study the relation between the IR luminosity (LIR) and the dust temperature (T) of dusty starbursting galaxies at high redshifts (high-z). We focus on the total IR luminosity from the cold-dust component ({L}{IR}({cd)}), whose emission …
In-situ observations of flux ropes formed in association with a pair of spiral nulls in magnetotail plasmas
Dunlop, Malcolm; He, Jiansen; Xie, Lun +9 more
Signatures of secondary islands are frequently observed in the magnetic reconnection regions of magnetotail plasmas. In this paper, magnetic structures with the secondary-island signatures observed by Cluster are reassembled by a fitting-reconstruction method. The results show three-dimensionally that a secondary island event can manifest the flux…
Wide Field CO Mapping in the Region of IRAS 19312+1950
Zhang, Yong; Hsia, Chih-Hao; Yung, Bosco H. K. +3 more
We report the results of wide field CO mapping in the region of IRAS 19312+1950. This Infrared Astronomical Satellite (IRAS) object exhibits SiO/H2O/OH maser emission, and is embedded in a chemically rich molecular component, the origin of which is still unknown. In order to reveal the entire structure and gas mass of the surrounding mo…
Current Sheet Structures Observed by the TESIS EUV Telescope during a Flux Rope Eruption on the Sun
Reva, A. A.; Ulyanov, A. S.; Kuzin, S. V.
We use the TESIS EUV telescope to study the current sheet signatures observed during flux rope eruption. The special feature of the TESIS telescope was its ability to image the solar corona up to a distance of 2 {R}⊙ from the Sun’s center in the Fe 171 Å line. The Fe 171 Å line emission illuminates the magnetic field lines, and the TES…
Space Weather at Comet 67P/Churyumov–Gerasimenko Before its Perihelion
Odstrcil, D.; Goldstein, R.; Richter, I. +8 more
Interplanetary scintillation observations, as well as the ENLIL 3D-MHD model when employed either separately or in combination with the observations, enable the making of predictions of the solar wind density and speed at locations in the inner heliosphere. Both methods are utilized here to predict the arrival at the Rosetta spacecraft and its adj…
Orbits of 12 Southern Binaries Based on Soar Speckle Observations
Docobo, J. A.; Mendez, R. A.; Campo, P. P. +1 more
New data obtained with the 4.1 m Southern Astrophysical Research (SOAR) telescope at Cerro Pachón, Chile, allowed us to revise the orbits and system masses of the following southern visual double stars: WDS 01477-4358 (I 52), WDS 01500-0408 (A 2602), WDS 02514-2139 (DON 43), WDS 03189-0101 (BU 1177), WDS 04142-4608 (RST 2338), WDS 06274-2544 (B 11…
New orbital ephemerides for the dipping source 4U 1323-619: constraining the distance to the source
Sanna, A.; Di Salvo, T.; Burderi, L. +6 more
Context. 4U 1323-619 is a low mass X-ray binary system that shows type I X-ray bursts and dips. The most accurate estimation of the orbital period is 2.941923(36) h and a distance from the source that is lower than 11 kpc has been proposed.
Aims: We aim to obtain the orbital ephemeris, the orbital period of the system, as well as its derivati…
The XMM Cluster Survey: evolution of the velocity dispersion-temperature relation over half a Hubble time
Hilton, Matt; Stott, John P.; Thomas, Peter A. +26 more
We measure the evolution of the velocity dispersion-temperature (σv-TX) relation up to z = 1 using a sample of 38 galaxy clusters drawn from the XMM Cluster Survey. This work improves upon previous studies by the use of a homogeneous cluster sample and in terms of the number of high-redshift clusters included. We present here…
A case study of a density structure over a vertical magnetic field region in the Martian ionosphere
Gurnett, D. A.; Lundin, R.; Morgan, D. D. +3 more
One of the discoveries made by the radar sounder on the Mars Express spacecraft is the existence of magnetically controlled structures in the ionosphere of Mars, which result in bulges in the ionospheric electron density contours. These bulges lead in turn to oblique echoes, which show up as hyperbola-shaped features in the echograms. A hyperbola-…