Search Publications
The multi-wavelength study of the effect of energetic particle beams on the chromospheric emission in the 25th July 2004 solar flare
Zharkova, V. V.; Kashapova, L. K.; Chornogor, S. N. +1 more
We present the multi-wavelength study of short-term variations of Hα line emission located in multiple kernels on the both sides from magnetic neutral line in the 25th July 2004 solar flare observed by VTT (Tenerife). The HXR and Hα emission in the kernels 1 and 3 is close spatially and temporally while in kernels 4 and 7 there is only delayed Hα …
Observed flux density enhancement at submillimeter wavelengths during an X-class flare
Mandrini, C. H.; Giménez de Castro, C. G.; Cristiani, G. +4 more
We analyse the 30 October, 2004, X1.2/SF solar event that occurred in AR 10691 (N13 W18) at around 11:44 UT. Observations at 212 and 405 GHz of the Solar Submillimeter Telescope (SST), with high time resolution (5 ms), show an intense impulsive burst followed by a long-lasting thermal phase. EUV images from the Extreme Ultraviolet Imaging Telescop…
On anticorrelation of number of coronal bright points with sunspot number during 1996 2006
Karachik, Nina V.; Pevtsov, Alexei A.; Sattarov, Isroil +1 more
Using full disk SOHO/EIT data from 1996 to 2006, we study latitudinal distribution of coronal bright points over a period of one solar cycle. We confirm the presence of two distinct types of coronal bright points, and find that the number of "quiet corona" bright points in high latitudes anticorrelate with solar activity as defined by the sunspot …
Risk of dust particle impacts during the Rosetta asteroid fly-bys
Rossi, A.; Fulchignoni, M.
On its course to the comet 67P/Churyumov-Gerasimenko, Rosetta will fly past two main belt asteroids: 2867 Steins and 21 Lutetia. In order to explore the possible risks of impact between the Rosetta probe and particles orbiting 21 Lutetia, the asteroid's dynamical environment is studied. Stable retrograde, nearly equatorial orbits, for small partic…
Several problems in measuring solar vector magnetic fields
Zhang, H. Q.; Ruan, G. P.; Su, J. T. +1 more
Observations of solar photosphere vector magnetic fields with a magnetograph are subjected to many difficulties, such as azimuth ambiguity, magnetic saturation, Faraday rotation, scattered light, polarization crosstalk, and wavelength shift, and so on. Among these issues, Faraday rotation and scattered light are obvious in local-region vector magn…
Quiet sun XUV and EUV spectroscopy
Lemaire, P.
The two XUV-EUV spectrometers on SOHO have collected a large amount of data in the 6000-10 6 K solar plasma temperature range. These data have allowed us to greatly enhance our knowledge of the processes acting in the solar atmosphere, from the chromosphere to the corona. Some results on the quiet Sun structure (network, quiet Sun versu…
Detection of CFIRB with AKARI/FIS deep observations
Nakagawa, Takao; Shirahata, Mai; Jeong, Woong-Seob +8 more
The Cosmic Far-Infrared Background (CFIRB) contains information about the number and distribution of contributing sources and thus gives us an important key to understand the evolution of galaxies. Using a confusion study to set a fundamental limit to the observations, we investigate the potential to explore the CFIRB with AKARI/FIS deep observati…
Solar X-ray and EUV corona and their relation to the magnetic activity
Benevolenskaya, Elena E.
We have studied the solar magnetic cycle in corona using X-ray data from YOHKOH and Extreme Ultraviolet data from SOHO/EIT. Soft X-ray data last the period from after the maximum cycle 22 to the maximum cycle 23 (1991-2001). The SOHO/EIT Extreme Ultraviolet data are used for the period from 1996 to 2003. These data provide us a unique opportunity …
The dynamics of the minimum solar corona during the period August October 1996
Schwenn, R.; Mierla, M.; Teriaca, L. +2 more
The paper presents the dynamics of the solar corona at the minimum phase of the solar cycle (period August-October 1996), as inferred from LASCO-C1 spectral data. LASCO-C1 is an internally occulted coronagraph aboard the SOHO spacecraft. It has a tunable Fabry-Pérot interferometer which allows taking spectral scans of selected coronal emission lin…
The COSAC experiment of the Rosetta mission: Performance under representative conditions and expected scientific return
Rosenbauer, H.; Szopa, C.; Goesmann, F. +2 more
The Cometary Sampling and Composition (COSAC) experiment is a combined gas chromatograph-mass spectrometer onboard the Philae cometary surface probe of the Rosetta mission. Its goal is to analyse, directly at the surface of a comet, the molecular and elemental compositions of the cometary nucleus samples collected by the probe. The present article…