Search Publications
Missions
Journals
Publication Years
Dawn-dusk difference of periodic oxygen EUV dayglow variations at Venus observed by Hisaki
Leblanc, François; Tsuchiya, Fuminori; Seki, Kanako +8 more
We report a dawn-dusk difference of periodic variations of oxygen EUV dayglow (OII 83.4 nm, OI 130.4 nm and OI 135.6 nm) in the upper atmosphere of Venus observed by the Hisaki spacecraft in 2015. Observations show that the periodic dayglow variations are mainly controlled by the solar EUV flux. Additionally, we observed characteristic ∼1 day and …
Is there another coincidence problem at the reionization epoch?
Lombriser, Lucas; Smer-Barreto, Vanessa
The cosmological coincidences between the matter and radiation energy densities at recombination as well as between the densities of matter and the cosmological constant at the present time are well known. We point out that, moreover, the third intersection between the energy densities of radiation and the cosmological constant coincides with the …
MAGIC observations of the microquasar V404 Cygni during the 2015 outburst
Maraschi, L.; Covino, S.; Antonelli, L. A. +143 more
The microquasar V404 Cygni underwent a series of outbursts in 2015, June 15-31, during which its flux in hard X-rays (20-40 keV) reached about 40 times the Crab nebula flux. Because of the exceptional interest of the flaring activity from this source, observations at several wavelengths were conducted. The MAGIC telescopes, triggered by the INTEGR…
CLUSIM: A Synthetic Aperture Radar Clutter Simulator for Planetary Exploration
Sánchez-Cano, B.; Witasse, O.; Orosei, R. +1 more
In this paper we present the CLUtter SIMulator (CLUSIM), a special program simulating radar side echoes from rough planetary surfaces using realistic topography data sets. A numerical model of realistic topography of the Martian surface, based on Mars Orbiter Laser Altimeter data, is developed. A specially developed computer routine for evaluation…
27 August 2001 substorm: Preonset phenomena, two main onsets, field-aligned current systems, and plasma flow channels in the ionosphere and in the magnetosphere
Moiseev, A. V.; Wang, J. Y.; Mishin, V. M. +2 more
We supplement the results of the 27 August 2001 substorm studied earlier in the series of papers. Described is the plasma flow in the nightside ionosphere from the near-polar region from the polar cap to the auroral oval during the substorm preonset phase and two expansion onsets, EO1 and EO2, produced by reconnection in the closed tail (magnetic …
The SCUBA-2 Ambitious Sky Survey: a catalogue of beam-sized sources in the Galactic longitude range 120°-140°
Chrysostomou, Antonio; Serjeant, Stephen; Evans, A. +13 more
The SCUBA-2 Ambitious Sky Survey (SASSy) is composed of shallow 850-µm imaging using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) on the James Clerk Maxwell Telescope. Here we describe the extraction of a catalogue of beam-sized sources from a roughly 120 deg2 region of the Galactic plane mapped uniformly (to an rms l…
The Nuclear X-Ray Emission-line Structure in NGC 2992 Revealed by Chandra-HETGS
Nowak, M. A.; Marshall, H. L.; Murphy, K. D.
We present the narrow emission-line structure revealed by a 135 ks Chandra observation of Seyfert galaxy NGC 2992, using the High Energy Transmission Grating Spectrometer. The source was observed in an historically low-flux state. Using a Bayesian Block search technique, we detected neutral Si Kα and S Kα fluorescence and two additional lines that…
The effect of X-ray dust scattering on a bright burst from the magnetar 1E 1547.0-5408
Pintore, Fabio; Mereghetti, Sandro; Esposito, Paolo +3 more
A bright burst, followed by an X-ray tail lasting ∼10 ks, was detected during an XMM-Newton observation of the magnetar 1E 1547.0-5408 carried out on 2009 February 3. The burst, also observed by Swift/BAT, had a spectrum well fitted by the sum of two blackbodies with temperatures of ∼4 and 10 keV and a fluence in the 0.3-150 keV energy range of ∼1…
Geomorphological and spectrophotometric analysis of Seth's circular niches on comet 67P/Churyumov-Gerasimenko using OSIRIS images
Jorda, L.; Lamy, P. L.; Lara, L. M. +51 more
We provide a detailed geomorphological and spectrophotometric analysis of the circular niches located on the Seth region of 67P using OSIRIS images. The features can be related to landslide events that occurred on 67P and shaped its surface, as the recent Aswan cliff collapse detected in the same region. We therefore provide an analysis of the are…
A study of the long term evolution in active region upflows
Harra, Louise K.; Ugarte-Urra, Ignacio; Baker, Deborah +5 more
Since their discovery, upflows at the edges of active regions have attracted a lot of interest, primarily as they could potentially contribute to the slow solar wind. One aspect that has not been studied yet is how the long term evolution of active regions impacts the upflows. In this work, we analyze one active region that survives three solar ro…