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51.
L van Driel-Gesztelyi P.K Manoharan M Pick P.P Démoulin 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1997,19(12):1883-1886
Yohkoh X-ray images, multifrequency two-dimentional observations of the Nancay Radioheliograph, Kitt Peak and Mees magnetograms provide a unique set of data with which to study a C4.7 long-duration flare that was observed close to the equator (S07, W11) on 25 Oct. 1994 at 09:49 UT. Linear force-free field extrapolations indicate a very high degree of non-potentiality in the active region. The X-ray flare started with the expansion of spectacular twisted loops. Fifteen minutes after the flare onset sporadic radio (type III) bursts were observed spreading over an area of almost 1/3 of the solar disc and two remote X-ray brightenings appeared over quiet regions of opposite magnetic polarity located in on opposite hemispheres of the Sun. In the close vicinity of these remote brightenings two coronal holes formed. The timing and location of these events combined with the overall magnetic configuration provide evidence for a large-scale magnetic reconnection occurring between the expanding twisted loops and the overlying huge loops which inter-connect quiet solar regions. 相似文献
52.
H. Nieuwenhuijzen F. P. Israel C. Slottje L. B. F. M. Waters J. Kleczek K. Werner M. Barylak Patricia Whitelock Ľ Kresák G. Meynet K. A. van der Hucht D. Stickland 《Space Science Reviews》1992,61(3-4):393-417
The general significance of streamers of the solar corona is discussed in the frame of our knowledge of the solar wind phenomenon and the large-scale solar magnetic structure. Thermodynamical and geometric parameters of streamers observed and measured at total solar eclipses are reviewed. Both the low part (in the form of a helmet with a cusp) and the external part (in the form of a stalk extended at many solar radii) are considered. The modelling of streamers starts with the analysis of effects produced by the solar wind flow on a magnetic structure. Facts and arguments are presented in favor of a model with a current sheet and reconnection processes going on along the axis of the streamer, especially in the non-collisional part of the radially extended streamer. Further development of the Pneuman and Kopp (1971) model is discussed, including difficulties occurring in the interpretation of a stationary solution. An empirical model satisfying observations is presented. Future researchs on streamers were discussed with emphasis on observations to be done with the space-borne coronagraphs on the SOHO spacecraft. 相似文献
53.
J J van Loon J P Veldhuijzen E J Windgassen T Brouwer K Wattel M van Vilsteren P Maas 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1994,14(8):289-298
To study the effects of weightlessness on mouse fetal long bone rudiment growth and mineralization we have developed a tissue culture system for the Biorack facility of Spacelab. The technique uses standard liquid tissue culture medium, supplemented with NA-beta-glycerophosphate, confined in gas permeable polyethylene bags mounted inside ESA Biorack Type I experiment containers. The containers can be flushed with an air/5% CO2 gas mixture necessary for the physiological bicarbonate buffer used. Small amounts of fluid can be introduced at the beginning (e.g. radioactive labels for incorporation studies) or at the end of the experiment (fixatives). A certain form of mechanical stimulation (continuous compression) can be used to counteract the, possibly, adverse effect of microgravity. Using 16 day old metatarsals the in vitro calcification process under microgravity conditions can be studied for a 4 day period. 相似文献
54.
J. Jongbloed J. van Diggelen C. de Jager H. Busch J. J. Vos 《Space Science Reviews》1967,6(4):574-576
55.
Reconstructed attitude data for the Hipparcos mission as obtained in the final stages of the data analysis for the published
catalogue is used to derive detailed information on the dynamics of the satellite. Most elements of the inertia tensor of
the satellite could be calibrated from the observed acceleration data, which are also used to reconstruct torques due to solar
radiation and gravity gradient, and the magnetic moment of the satellite and it's interaction with the magnetic field surounding
the Earth. The effects of the oblateness of the Earth on the gravity gradient are evaluated and shown to be negligable. The
magnetic field model includes both the `main' and the `disturbance' fields. The remaining systematic effects in residual torques
are most likely attributed to variations in the magnetic field that are local and are beyond the models used to describe it.
The angular momentum vector for one of the gyros was reconstructed from the torque it asserted on the satellite while it was
running in redundant mode.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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Jan Jurčák Manuel Collados Jorrit Leenaarts Michiel van Noort Rolf Schlichenmaier 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2019,63(4):1389-1395
The European Solar Telescope (EST) is a project of a new-generation solar telescope. It has a large aperture of 4?m, which is necessary for achieving high spatial and temporal resolution. The high polarimetric sensitivity of the EST will allow to measure the magnetic field in the solar atmosphere with unprecedented precision. Here, we summarise the recent advancements in the realisation of the EST project regarding the hardware development and the refinement of the science requirements. 相似文献
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