排序方式: 共有18条查询结果,搜索用时 656 毫秒
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Janusz Sylwester Zbigniew Kordylewski Stefan Płocieniak Marek Siarkowski Mirosław Kowaliński Stanisław Nowak Witold Trzebiński Marek Śtęślicki Barbara Sylwester Eugeniusz Stańczyk Ryszard Zawerbny Żaneta Szaforz Kenneth J. H. Phillips František Fárník Anatolyi Stepanov 《Solar physics》2015,290(12):3683-3697
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M. Siarkowski 《Solar physics》1984,94(1):105-115
In the paper it is investigated how the non-Maxwellian electron velocity distribution function associated with steep temperature gradient affects the cyclotron radio emission at centimeter wavelengths. The results obtained were used to calculate the distribution of the brightness temperature across a sunspot. The presence of the large electron temperature gradient in the transition region may lead to a significant increase of the observed brightness temperature (up to several tens of percent) in comparison with the brightness temperature obtained by assumption of the Maxwellian distribution function. 相似文献
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Solar Physics - An application of nonlinear least squares methods for determining the temperature models of coronal active regions, based on the measured X-ray line intensities, is described. These... 相似文献
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A. Kepa J. Sylwester B. Sylwester M. Siarkowski A. I. Stepanov 《Solar System Research》2006,40(4):294-301
The differential emission measure (DEM) describes the temperature distribution of the emitting plasma. The DEM distribution allows one to study the physical conditions and the energy of flares in detail (including the mean temperature and the total emission measure). In this paper, we analyze the time changes of the DEM distributions for a selected flare, which has been observed with the RESIK instrument. To calculate the differential emission measure, we used the Withbroe-Sylwester (W-S) iterative algorithm corresponding to the maximum likelihood procedure. The required emission functions were calculated with the CHIANTI package. We calculated the DEM for four available estimates of the ionization equilibrium and coronal composition of plasma. 相似文献
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S. Gburek J. Sylwester M. Kowalinski J. Bakala Z. Kordylewski P. Podgorski S. Plocieniak M. Siarkowski B. Sylwester W. Trzebinski S. V. Kuzin A. A. Pertsov Yu. D. Kotov F. Farnik F. Reale K. J. H. Phillips 《Solar System Research》2011,45(3):189-199
The goals and construction details of a new design Polish-led X-ray spectrophotometer are described. The instrument is aimed to observe emission from entire solar corona and is placed as a separate block within the Russian TESIS X- and EUV complex aboard the CORONAS-PHOTON solar orbiting observatory. SphinX uses silicon PIN diode detectors for high time resolution measurements of the solar spectra in the range 0.8–15 keV. Its spectral resolution allows for discerning more than hundred separate energy bands in this range. The instrument dynamic range extends two orders of magnitude below and above these representative for GOES. The relative and absolute accuracy of spectral measurements is expected to be better than few percent, as follows from extensive ground laboratory calibrations. 相似文献
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M. Siarkowski J. Sylwester G. Bromboszcz V. V. Korneev S. L. Mandelshtam S. N. Oparin A. M. Urnov I. A. Zhitnik S. Vasha 《Solar physics》1982,77(1-2):183-203
In this paper, the second in a series dealing with high-resolution spectra (9.14–9.33 Å) measured on board the INTERCOSMOS-16 satellite, the analysis of the physical conditions in the coronal part of the McMath 14352 active region is performed. The temperature structure of the emitting plasma is investigated on the basis of the photon fluxes measured in six selected wavelength bands involving the resonance, intercombination, and forbidden lines of the Mg xi ion and a number of satellite lines. Relative line intensities are discussed in terms of the active region plasma density. 相似文献
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J. Sylwester I. Gaicki Z. Kordylewski M. Kowaliński S. Nowak S. Płocieniak M. Siarkowski B. Sylwester W. Trzebiński J. Bakała J. L. Culhane M. Whyndham R. D. Bentley P. R. Guttridge K. J. H. Phillips J. Lang C. M. Brown G. A. Doschek V. D. Kuznetsov V. N. Oraevsky A. I. Stepanov D. V. Lisin 《Solar physics》2005,226(1):45-72
We describe the RESIK (REntgenovsky Spektrometr s Izognutymi Kristalami) instrument, consisting of two double-channel X-ray spectrometers, designed to observe solar active region and flare plasmas. RESIK is one of the instruments making up the scientific payload of the Russian CORONAS-F solar mission. The uncollimated spectrometer uses two silicon and two quartz bent crystals observing flare, active region and coronal spectra in four wavelength bands with a resolving power (/ ) of 1000. The wavelength coverage, 3.3–6.1 Å, includes emission lines of Si, S, Cl, Ar, and K and in the third diffraction order, the wavelength range includes He-like Fe lines (1.85 Å) and Ni lines (1.55 Å) with dielectronic satellites, emitted during intense, hot flares. The instrument is believed to be the best calibrated space-borne crystal spectrometer flown to date. The spectrometer dynamically adjusts the data gathering intervals from 1 s to 5 minutes, depending on the level of solar X-ray emission at the time of observation. The principal aims of RESIK are the measurements of relative and absolute element abundances in the emitting plasma and the temperature distribution of plasma (differential emission measure) over the temperature interval 3 and 50 MK. This paper summarizes the scientific objectives of RESIK and describes the design, characteristics, and performance of the instrument. 相似文献