Search Publications
Sporadic plasma streams and their sources in the period of extraordinary solar activity from October 26 to November 6, 2003
Eselevich, M. V.; Eselevich, V. G.
Based on the results of investigations made by various authors applying different semiempirical models, we have formulated the principles of a complex method that allows one to associate sporadic streams of the solar wind (SW) at the Earth’s orbit with coronal mass ejections (CMEs), which are their sources on the Sun. This method is applied to an …
Measurements of brightness and nonradial direction of coronal streamers according to data of SOHO/Large Angle and Spectrometric Coronagraph Experiment (LASCO)-C2
Tlatov, A. G.; Kim, Gun-Der; Makarov, V. I.
Daily observations of the corona were processed according to the data of coronagraph SOHO/Large Angle and Spectrometric Coronagraph Experiment (LASCO)-C2 to study the variations of brightness and nonradial direction of coronal streamers during 1996.5-2003.5. Photometry of coronal images was carried out at heights of $2.3~R\odot-5.5~R_{\…
Numerical simulation of the visible and near infrared radiance of Mars: effects of atmospheric scattering
Erard, S.; Blecka, M. I.
This paper presents new simulations of the radiance of the surface and atmosphere of Mars. Our modeling is directly connected with future spectrometric measurements of two instruments on Mars Express (short-wavelength channel of PFS and OMEGA) and of the VIRTIS spectrometer on-board Rosetta which was planned for observation of Mars in August 2005.…
Optimal Galaxy Shape Measurements for Weak Lensing Applications Using the Hubble Space Telescope Advanced Camera for Surveys
Ferguson, Henry C.; Casertano, Stefano; Park, Yousin
We present three-epoch multiband (V606, i775, and z850) measurements of galaxy shapes using the ``polar shapelet'' or Laguerre expansions method with the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) data, obtained as part of the Great Observatories Origin Deep Survey (GOODS). We take advantage of …
The circumstellar environment of the star V923 Aquilae
Ringuelet, A. E.; Arias, M. L.; Cidale, L. S.
Flickering Red Giants in the Ursa Minor Dwarf Spheroidal Galaxy: Detection of Low-Amplitude Variability in Faint Red Giant Branch Stars on 10 Minute Timescales
Roederer, Ian U.; Mighell, Kenneth J.
We have analyzed two epochs of Hubble Space Telescope Wide Field Planetary Camera 2 observations of the Ursa Minor dwarf spheroidal galaxy using the HSTphot photometric reduction package. We report the detection of nine faint (MV>~0.0 mag) red giant variable stars that exhibit low-amplitude brightness fluctuations on 10 minute timesc…
High resolution spectroscopy of Seyfert warm absorbers with XMM-Newton
Kaastra, J. S.; Behar, E.; Sako, M. +5 more
We present results from the analysis of an XMM-Newton observation of the Seyfert 1 galaxy NGC 7469, the first high resolution X-ray spectrum of this source. The Reflection Grating Spectrometer (RGS) spectrum has several narrow absorption and emission lines of O, N, C and Ne, originating from gas at a range of ionisation parameters, from log ξ∼1.6 …
Re-Evaluation of the Flare Type II CME Association
Kim, Y. -H.; Moon, Y. -J.; Shanmugaraju, A. +2 more
We have re-evaluated the association of type II solar radio bursts with flares and/or coronal mass ejections (CMEs) using the year 2000 solar maximum data. For this, we consider 52 type II events whose associations with flares or CMEs were absent or not clearly identified and reported. These events are classified as follows; group I: 11 type IIs f…
On putting the catalogues of the relative proper motions of open cluster stars in one system (cluster M67)
Loktin, A. V.
In this paper a method for putting the catalogues of the proper motions of cluster stars in one system is discussed on the base of numerical experiments. The catalogue of proper motions of stars in the field of open cluster M67 based on five catalogues of relative proper motions and the Tycho-2 catalogue is compiled.
A joint Cluster and ground-based instruments study of two magnetospheric substorm events on 1 September 2002
Lester, M.; Bosqued, J.; Provan, G. +9 more
We present a coordinated ground- and space-based multi-instrument study of two magnetospheric substorm events that occurred on 1 September 2002, during the interval from 18:00 UT to 24:00 UT. Data from the Cluster and Polar spacecraft are considered in combination with ground-based magnetometer and HF radar data. During the first substorm event th…