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Solar constant

About: Solar constant is a research topic. Over the lifetime, 967 publications have been published within this topic receiving 29647 citations.


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Book ChapterDOI
01 Jan 1988
TL;DR: In this paper, the power spectra of the time series of 270 days in 1980 and of 240 days in 1984 are analyzed using a statistical method for the determination of the basic g-mode period separation To and the rotational frequency v R.
Abstract: Solar irradiance data from the AC RIM solar constant experiment on board the Solar Maximum Mission satellite (SMM) have been used to search for solar gravity modes. The power spectra of the time series of 270 days in 1980 and of 240 days in 1984 are analysed using a statistical method for the determination of the basic g-mode period separation To and the rotational frequency v R. In the view of the proposal of weakly interacting massive particles (WIMP) in the solar core and their impact on T0 the search has been extended down to 25 minutes. The results of the analysis of both time series in the frequency range from 10 to 40 μHz are best fitted by a T0 of 29.85 minutes. This is close to the expected value for the WIMP model. The angular velocity in the center of the Sun inferred from the rotational splitting of the g-modes amounts to 6.6•10-6 per sec, which is 2.3 times the photospheric rate.

7 citations

Journal ArticleDOI
TL;DR: In this paper, the authors report on the design, construction and testing of a wide-beam continuous solar simulator which can be used to simulate air mass zero (AM0) solar irradiance at fluxes of up to 6.5 solar constants.
Abstract: We report on the design, construction and testing of a wide-beam continuous solar simulator which can be used to simulate air mass zero (AM0) solar irradiance at fluxes of up to 6.5 solar constants. The instrument has been designed to produce a steady collimated beam with a homogeneous flux distribution across an aperture area of diameter 290 mm. The instrument is being used to test hardware designed to fly on the ESA/JAXA space mission to Mercury, BepiColombo. It has applications for other spacecraft missions which envisage passing inside the orbit of Venus (e.g. Solar Orbiter).

7 citations

01 Jun 1975
TL;DR: The current status of knowledge of the total and spectral irradiance of the sun is briefly reviewed in this article, with special emphasis on the Solar Energy Monitor in Space experiment, which is a combination of a solar constant detector and a prism monochromator.
Abstract: The present status of knowledge of the total and spectral irradiance of the sun is briefly reviewed. Currently accepted values of the solar constant and the extraterrestrial solar spectral irradiance are presented along with a discussion of how they were derived. Data on the variability of the solar constant are shown to be conflicting and inconclusive. Some of the alleged sun-weather relationships are cited in support of the need of knowing more precisely the variations in total and spectral solar irradiance. An overview of a solar monitoring program is discussed, with special emphasis on the Solar Energy Monitor in Space experiment which was proposed for several spacecraft missions. It is a combination of a solar constant detector and a prism monochromator. The determination of absolute values and the possible variations of the total and spectral solar irradiance, from measurements outside of the atmosphere is discussed.

7 citations

Journal ArticleDOI
TL;DR: X-ray astronomy began in 1948 with the first detection of X-rays from the Sun as discussed by the authors, and about 100,000 X-ray sources are known all over the sky.
Abstract: X-ray astronomy began in 1948 with the first detection of X-rays from the Sun. Astronomical X-ray observations need to be performed from high-altitude rockets and satellites because the Earth's atmosphere absorbs X-rays. Currently about 100,000 X-ray sources are known all over the sky. The Sun is by far the strongest source. The outermost solar atmosphere, the corona, emits X-rays due to its high temperature of a few million K. Solar X-ray emission is highly variable. Eruptions lead to variations of the X-ray flux on time scales of minutes. The average X-ray flux varies with the 11-year sunspot cycle by a factor of about 1000. Solar X-rays have a profound influence on the Earth's upper atmosphere.

7 citations

Journal ArticleDOI
01 Dec 1980-Nature

7 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20238
202215
20219
20202
201911
201810