Search Publications
Missions
Journals
Publication Years
The Discovery of the Nearest Star
Glass, I. S.
In the 1830s, the double star α Centauri was the subject of the first successful stellar parallax measurement. For almost eighty years it remained the nearest star known. However, in 1915 at the Union Observatory in Johannesburg, R.T.A. Innes found a faint object near α Cen with a similar proper motion. Its parallax was measured over the following…
Turbulent and directed mass motions in various structures of the low corona
Delone, A. B.; Yakunina, G. V.; Porfir'eva, G. A. +1 more
[1] A brief review on turbulent and ordered plasma motions in the solar corona is presented. Velocities in quiet coronal regions, coronal loops, coronal holes, and cavities around quiescent prominences are analyzed. Data based on interferometric observations of several total solar eclipses obtained earlier by the authors and in addition the values…
Europe Goes to the Venus - The Journey of Venus Express
Fabrega, J.; Schirmann, T.; McCoy, D. +1 more
On 9th November 2005, a Russian Soyuz-Fregat launcher boosted Venus Express into space from the Baikonur cosmodrome, in Kazakhstan. The spacecraft reached its final destination 5 months later, on 11th April 2006, after a journey of 440 millions of kilometres in the solar system. It fired its main engine during 49 minutes and slowed down to be capt…
On the Hipparcos Link to the ICRF derived from VLA and MERLIN radio astrometry
Walter, H. G.; Hering, R.
Positions and proper motions obtained from observations by the very large array (VLA) and the multi-element radio-linked interferometer network (MERLIN) are used to establish the link of the Hipparcos Celestial Reference Frame (HCRF) to the International Celestial Reference Frame (ICRF). The VLA and MERLIN data are apparently the latest ones publi…
MIMS—A relational database of imagery on Mars
Vaz, D.; Ivo Alves, E.
On wave modes, structures and turbulence in space plasmas: Cluster results
Belmont, G.; Sahraoui, F.; Rezeau, L. +2 more
Magnetic turbulence is known to play a key role in magnetospheric physics since it is involved in all the microphysical processes: energy cascade and dissipation, structure formation, mass transport and particles acceleration, magnetic reconnection, etc. Identifying the experimental properties of turbulence has been therefore one of the major goal…
The statistical characteristics of the tailward flows in the near-Earth region explored by TC1
Shen, Chao; Wang, Ji-Ye; Zhang, Ling-Qian +3 more
During quiet time and substorm process, tailward flow often explored in the near-Earth magnetotail by TC-1 satellite. The tailward flow is most strong near the equator, and stronger in the dusk-side and dawn-side than that in the night-side. The tailward flow tends to move from the dusk-side and dawn-side to the night-side, and becomes stronger wh…
Planetary science: Hyperion the sponge
Webb, Richard
The distribution characteristics of the flows in the near-Earth region: TC-1 observational results
Shen, Chao; Zhang, LingQian; Liu, ZhenXing +4 more
TC-1 observational results clearly indicate that the velocity of the flows in the near-Earth region is dependent on the satellite location. The flow speed decreases while satellite moves close to the Earth. The plasma flow in the region close to the Earth tends to drift into the midnight region from the dawn and dusk region while the flow in the r…
Photometric observations and frequency analysis of the δ Scuti NT Hya
Gavras, P.; Sinachopoulos, D.
NT Hya is a δ Scuti star discovered by Hipparcos. About 2200 observations were acquired with the 30 inch SAAO telescope in the nights of February 2,3 and 4, 2006 in V filter. These data show four pulsation frequencies of the star. Two of them may form a doublet separated by 0.64 c/d (Δf/f = 9%) with similar amplitudes. The period listed in the Hip…