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Several automated optical telescopes have been setup at appropriate longitudes around the globe to study earthshine variations
and asteroseismology. The first telescope has been setup at Teide Observatory, Tenerife, Spain in October 2004. The intensity
of earthshine relates to the average of Earth’s albedo, and in turn relates to the global temperature of the Earth. A global
network is necessary because each site can measure the earthshine reflected from only a part of the Earth. The network will
also be used for asteroseismology study. It can measure photometric variations of pulsating stars. The long-term and continuous
measurements allow the accurate determination of mode frequencies of stellar pulsations, which provides information on the
properties of stellar interior. 相似文献
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We describe the present status of the project of the Taiwan Oscillation Network (TON) and discuss a scientific result using
the TON data. The TON is a ground-based network to measure solar intensity oscillations for the study of the solar interior.
Four telescopes have been installed in appropriate longitudes around the world. The TON telescopes take K-line full-disk solar
images of diameter 1000 pixels at a rate of one image per minute. The data has been collected since October of 1993. The TON
high-spatial-resolution data are specially suitable for the study of local properties of the Sun. In 1997 we developed a new
method, acoustic imaging, to construct the acoustic signals inside the Sun with the acoustic signals measured at the solar
surface. From the constructed signals, we can form intensity map and phase-shift map of an active region at various depths.
The direct link between these maps and the subsurface wave-speed perturbation suffers from the poor vertical resolution of
acoustic imaging. Recently an inversion method has been developed to invert the measured phase travel time perturbation to
estimate the distribution of wave-speed perturbation based on the ray approximation. This technique of acoustic imaging has
been used to image the far-side of the Sun that could provides information on space weather prediction.
The TON Team includes: Antonio Jimenez (Instituto Astrofisica de Canarias, Spain); Guoxiang Ai and Honqi Zhang (Huairou Solar
Observing Station, P.R.C.); Philip Goode and William Marquette (Big Bear Solar Observatory, U.S.A.); Shuhrat Ehgamberdiev
and Oleg Ladenkov (Ulugh Beg Astronomical Institute, Uzbekistan)
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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Helioseismology uses solar p-mode oscillations to probe the structure of the solar interior. The modifications of p-mode properties
due to the presence of solar magnetic fields provide information on the magnetic fields in the solar interior. Here we review
some of results in helioseismology on the magnetic fields in the solar convection zone. We will also discuss a recent result
on the magnetic fields at the base of the convection zone.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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