Search Publications
Flare on 2011 September 22 and coronal mass ejection from observations in the He I 10830-Å line
Marchenko, G. P.; Akimov, L. A.; Belkina, I. L.
In this paper, we present the results from a study of the X1.4/2N flare and the accompanying coronal mass ejection (CME) on 2011 September 22 from observations of the spectral region around the He I 10830-Å line. In the study, 20 He I 10830-Å line images of the full disc of the Sun and 20 dopplerograms were obtained. Parts of the active region (AR…
The INTErnational Gamma Ray Astrophysics Laboratory: INTEGRAL Highlights
Ubertini, Pietro; Bazzano, Angela
The INTEGRAL Space Observatory was selected as the second Medium size mission (M2) of the ESAs Horizon 2000 vision programme. INTEGRAL is the first high angular and spectral resolution hard X-ray and soft γ-ray observatory with a wide band spectral response ranging from 3 keV up to 10 MeV energy band. This capability is supplemented by an unpreced…
Dust Impact Monitor (DIM) onboard Rosetta/Philae: Tests with ice particles as comet analog materials
Flandes, Alberto; Krüger, Harald; Loose, Alexander +2 more
In 2014 the European Space Agency's spacecraft Rosetta will encounter the short-period comet 67P/Churyumov-Gerasimenko. Rosetta carries the lander spacecraft Philae on board which will attempt to land on the comet's nucleus. Amongst Philae's instruments, the Dust Impact Monitor (DIM) using piezoelectric sensors is aimed at measuring the physical p…
A study of line widths and kinetic parameters of ions in the solar corona
Wu, D. J.; Zhao, G. Q.; Wang, C. B.
Solar extreme-ultraviolet (EUV) lines emitted by highly charged ions have been extensively studied to discuss the issue of coronal heating and solar wind acceleration. Based on observations of the polar corona by the SUMER/SOHO spectrometer, this paper investigates the relation between the line widths and kinetic parameters of ions. It is shown th…
Resolved photometry of young massive clusters in the starburst galaxy NGC 4214
Cignoni, M.; Tosi, M.; Bragaglia, A. +4 more
We present the results of deep high-resolution imaging performed with Advanced Camera for Surveys (ACS)/HRC@HST in the most active region of the nearby starburst galaxy NGC 4214. We resolved the stellar populations of five young massive clusters and their surrounding galactic field. The star formation history of this region is characterized by two…
Herschel SPIRE FTS spectral mapping calibration
Valtchanov, Ivan; Hopwood, Rosalind; Lu, Nanyao +12 more
The Herschel SPIRE Fourier transform spectrometer (FTS) performs spectral imaging in the 447-1546 GHz band. It can observe in three spatial sampling modes: sparse mode, with a single pointing on sky, or intermediate or full modes with 1 and 1/2 beam spacing, respectively. In this paper, we investigate the uncertainty and repeatability for fully sa…
Phase Relationships Between the CME-Energy Cycle, the Sunspot-Area Cycle and the Flare-Index Cycle
Zhong, J.; Xie, J. L.; Gao, P. X.
We study the phase relationships between the coronal-mass-ejection (CME) energy cycle, the sunspot-area cycle, and the flare-index cycle from 1996 to 2010. The results show the following: i) The activity cycle of the flare index significantly leads the activity cycle of the sunspot area. ii) The activity cycle of the CME energy is inferred to be a…
Multiwavelength search for counterparts of supersoft X-ray sources in M31
Henze, M.; Orio, M.; Chiosi, E. +2 more
We searched for the optical/UV/IR counterparts of seven supersoft X-ray sources (SSSs) in M31 in the Hubble Space Telescope (HST) `Panchromatic Hubble Andromeda Treasury' (PHAT) archival images and photometric catalogue. Three of the SSSs were transient; the other four are persistent sources. The PHAT offers the opportunity to identify SSSs hostin…
First Ultraviolet Reflectance Measurements of Several Kuiper Belt Objects, Kuiper Belt Object Satellites, and New Ultraviolet Measurements of a Centaur
Stern, S. A.; Schindhelm, R.; Cunningham, N. J.
We observed the 2600-3200 Å (hereafter, mid-UV) reflectance of two Kuiper Belt Objects (KBOs), two KBO satellites, and a Centaur, using the Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS). Other than measurements of the Pluto system, these constitute the first UV measurements obtained of KBOs, and KBO satellites, and new HST UV meas…
Mapping lunar surface chemistry: New prospects with the Chandrayaan-2 Large Area Soft X-ray Spectrometer (CLASS)
Kellett, B. J.; Narendranath, S.; Sreekumar, P. +4 more
Surface chemistry of airless bodies in the solar system can be derived from remote X-ray spectral measurements from an orbiting spacecraft. X-rays from planetary surfaces are excited primarily by solar X-rays. Several experiments in the past have used this technique of X-ray fluorescence for deriving abundances of the major rock forming elements. …