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Roeland F. Van Oss 《Space Science Reviews》1994,68(1-4):309-320
The observed non-thermal emission from accreting compact objects is often understood in terms of the expected magnetic activity of accretion disks. This review discusses the constraints on this view point that can be obtained from, principally, the X-ray spectra and the X-ray variability of black hole candidates.Furthermore, the traditional view of an accretion disk corona, put forward as the source of the non-thermal emission, analogous to the solar corona is shown to be wrong on a few important points. Firstly, the density in the equilibrium accretion disk corona is extremely low. A reasonable plasma density is retained by pair production processes similar to those existing in the pulsar magnetosphere. Secondly, the dominant resistivity in the accretion the disk on the current carrying electrons. 相似文献
44.
Karel A. Van Der Hucht 《Space Science Reviews》1993,66(1-4):21-35
The numbers and distribution of Population I O-type stars and Wolf-Rayet stars are reviewed. The numbers of known WR stars in the Galaxy, the LMC and the SMC are 185, 114, and 9, respectively. Distances and galactic distributions determined by various authors are compared. The single star and binary distributions are discussed in the light of evolutionary studies. 相似文献
45.
A. A. Van Ballegooijen 《Space Science Reviews》1994,70(1-2):31-35
The formation of magnetic fine structures and associated electric currents is considered in the context of the coronal heating problem. The penetration of field-aligned electric currents into the lower atmosphere is discussed. It is argued that currents strong enough to heat the corona can persist only for short periods of time. The formation of thin current sheets is discussed. It is argued that photospheric magnetic structures (flux tubes) play an important role in the generation of coronal currents. 相似文献
46.
Leon Van Speybroeck 《Space Science Reviews》1972,13(4-6):845-869
47.
The low-energy neutral atom imager for IMAGE 总被引:1,自引:0,他引:1
Moore T.E. Chornay D.J. Collier M.R. Herrero F.A. Johnson J. Johnson M.A. Keller J.W. Laudadio J.F. Lobell J.F. Ogilvie K.W. Rozmarynowski P. Fuselier S.A. Ghielmetti A.G. Hertzberg E. Hamilton D.C. Lundgren R. Wilson P. Walpole P. Stephen T.M. Peko B.L. Van Zyl B. Wurz P. Quinn J.M. Wilson G.R. 《Space Science Reviews》2000,91(1-2):155-195
The `Imager for Magnetosphere-to-Aurora Global Exploration (IMAGE) will be launched early in the year 2000. It will be the first mission dedicated to imaging, with the capability to determine how the magnetosphere changes globally in response to solar storm effects in the solar wind, on time scales as short as a few minutes. The low energy neutral atom (LENA) imager uses a new atom-to-negative ion surface conversion technology to image the neutral atom flux and measure its composition (H and O) and energy distribution (10 to 750 eV). LENA uses electrostatic optics techniques for energy (per charge) discrimination and carbon foil time-of-flight techniques for mass discrimination. It has a 90°×° field-of-view in 12 pixels, each nominally 8°×°. Spacecraft spin provides a total field-of-view of 90°×360°, comprised of 12×45 pixels. LENA is designed to image fast neutral atom fluxes in its energy range, emitted by auroral ionospheres or the sun, or penetrating from the interstellar medium. It will thereby determine how superthermal plasma heating is distributed in space, how and why it varies on short time scales, and how this heating is driven by solar activity as reflected in solar wind conditions. 相似文献
48.
M. Van Der Klis 《Space Science Reviews》1992,62(1-2):173-202
The observational information on X-ray binaries that was collected with the 80 cm2 auxiliary X-ray detector onboard the COS-B gamma-ray satellite is reviewed. The results illustrate that in the study of X-ray binaries observations of long duration are extremely effective, even when using a small instrument. 相似文献
49.
de Jager C. Hartle James B. Drawin H. W. Giovanelli R. G. Freudenthal Hans Wittenberg H. Tobias Cornelius A. Van Der Laan H. Smit J. A. 《Space Science Reviews》1974,15(5):741-746
Space Science Reviews - 相似文献
50.
Grazing-incidence telescopes for X-ray astronomy 总被引:1,自引:0,他引:1
R. Giacconi W. P. Reidy G. S. Vaiana L. P. Van Speybroeck T. F. Zehnpfennig 《Space Science Reviews》1969,9(1):3-57
We review the progress made at our laboratory over the past several years in developing grazing-incidence imaging X-ray optics. Mirrors, detection systems and dispersion techniques are discussed and experimental results are given. We discuss the application of two telescope systems to a number of experimental observations in X-ray astronomy. 相似文献