Search Publications
Astrophysics of Dusty Stellar Winds from AGB Stars
Suh, Kyung-Won
Multifrequency constraints on the nonthermal pressure in galaxy clusters
Colafrancesco, S.; Marchegiani, P.; Mhlahlo, N. +1 more
Context. The origin of radio halos in galaxy clusters is still unknown and is the subject of a vibrant debate from both observational and theoretical points of view. In particular, the amount and the nature of nonthermal plasma and of the magnetic field energy density in clusters hosting radio halos is still unclear.
Aims: The aim of this pap…
Association of CMEs with solar surface activity during the rise and maximum phases of solar cycles 23 and 24
Li, Ting; Zhang, Jun; Gao, Peng-Xin
The cyclical behaviors of sunspots, flares and coronal mass ejections (CMEs) for 54 months from 2008 November to 2013 April after the onset of Solar Cycle (SC) 24 are compared, for the first time, with those of SC 23 from 1996 November to 2001 April. The results are summarized below. (i) During the maximum phase, the number of sunspots in SC 24 is…
Low-altitude electron acceleration due to multiple flow bursts in the magnetotail
Nilsson, H.; Hamrin, M.; Marghitu, O. +12 more
At 10:00 UT on 25 February 2008, Cluster 1 spacecraft crossed the near-midnight auroral zone, at about 2 RE altitude, while two of the Time History of Events and Macroscale Interactions During Substorms (THEMIS) spacecraft, THD and THE, observed multiple flow bursts on the near-conjugate plasma sheet field lines. The flow shear pattern …
The Dynamic Character of the Polar Solar Wind
Jackson, B. V.; Buffington, A.; Hick, P. P. +1 more
The Solar and Heliospheric Observatory (SOHO) Large Angle and Spectrometric Coronagraph C2 and Solar Terrestrial Relations Observatory (STEREO) COR2A coronagraph images, when analyzed using correlation tracking techniques, show a surprising result in places ordinarily thought of as "quiet" solar wind above the poles in coronal hole regions. Instea…
Reconstruction of High Dynamic Range Images: Simulations of LBT Observations of a Stellar Jet, a Pathfinder Study for Future AO-Assisted Giant Telescopes
Arcidiacono, C.; Lorenzetti, D.; Nisini, B. +4 more
Solar wind He pickup ions as source of tens-of-keV/n neutral He atoms observed by the HSTOF/SOHO detector
Hilchenbach, M.; Czechowski, A.; Grzedzielski, S. +1 more
Context. Since 1996, during periods of low solar activity, the HSTOF instrument on board the SOHO satellite has been measuring weak fluxes of He atoms of 28-58 keV/n (helium energetic neutral atoms, He ENAs). The probable source region is the inner heliosheath.
Aims: We aim to understand the emission mechanism of He ENAs based on knowledge of…
Measurements of the cosmic X-ray background of the Universe and the MVN experiment
Revnivtsev, M. G.
The paper is devoted to studying the cosmic X-ray background (CXB) of the Universe in the energy range 1-100 keV and to the prospects for its investigation by means of the projected MVN (Monitor Vsego Neba) experiment. The nature of the CXB and its use for studying the cosmological evolution of black holes are briefly discussed. The bulk of the pa…
Lunar photometric modelling with SMART-1/AMIE imaging data
Muinonen, K.; Videen, G.; Josset, J. -L. +2 more
We investigate the light-scattering properties of the lunar mare areas. A large photometric dataset was extracted from images taken by the AMIE camera on board the SMART-1 spacecraft. Inter-particle shadowing effects in the regolith are modelled using ray-tracing simulations, and then a phase function is fit to the data using Bayesian techniques a…
Properties of a large-scale flux rope and current sheet region on the dayside of Mars: MGS MAG/ER and MEX ASPERA-3 ELS observations
Barabash, Stas; Coates, Andrew J.; Frahm, Rudy A. +6 more
We present dual spacecraft observations by MGS MAG/ER and MEX ASPERA-3 ELS of a large-scale magnetic flux rope on the dayside of Mars that occurs in close proximity to the crustal magnetic fields and a dayside current sheet region. A current sheet (including the large-scale flux rope) was observed on repeated MGS orbits when the draped solar wind …