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The measure device for measuring and control of light conditions of plant growth
Melich, Zbyněk ; Melich, Radek ; Oupický, Pavel ; Šolc, Ivan ; Klimeš st., J. ; Klimeš ml., J.
Šolc birefringent polarizing filter for more spectral lines Šolc birefringent polarizing narrow - bandpass filters are successfully used for professional observations of solar chromosphere. They are usually constructed to work for only one transmitting wavelength. Principally it is possible to design such filters to transmit more narrow – banded spectral lines. Filter consist of two parts: Frontal part is broad – band filter, with which, required spectral line can be adjusted. Second – main part consists of 26 quartz plates. Filter is designed for observation of Sun in interesting spectral lines: KII, HY, BaII, HZ, D1, D3 and He.
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Scale invariance in the ionosphere
Šauli, Petra ; Abry, P. ; Cosson, X. ; Roux, S.
Scaling invariance domains represent domains where no preferential period of oscillation exists. Scaling laws always reveal an important property of the analysed system: self-similarity or multifractality. The observed ground-based and satellite ionospheric time series contain a mix of fluctuations of different physical origin (solar, geomagnetic, neutral atmosphere variability etc.). Description based on scaling features can be applied in the solar wind-magnetosphere-ionosphere interaction studies for further comparison of basic characteristics of intermittent fluctuations in solar wind, magnetosphere and ionosphere systems. Finding the similar scaling features of the solar and geomagnetic data in the ionospheric response might be a signature of common nature of the observed fluctuations. A comprehensive understanding of the scaling properties of the ionospheric indices has relevance for the predictability of the behaviour of the ionosphere within specified time range.
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Imaging system for spectrograph with multichanell Šolc filter
Rail, Zdeněk ; Lédl, Vít ; Jareš, Daniel
Solving the problem of solar spectrograph telescope,we have made research of possible imaging systems for spectrograph with multichanell Šolc filter.We have decided to use off-axis unobstructed Maksutov telescope,which is able to meet our demands for constant solar image scale in wavelenght within 380 to 760 nm.This telescope provides good image contrast similar to apochromatic objective lens uses only classical materials. Diameter of the telescope is 140 mm,focal length is 2000 mm.
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Measurement of the Basic Material Characteristics forTransmission of Chain Filter
Melich, Radek
Observing the Sun with birefringent filters is done mainly with filters tuned constantly on some interesting spectral wavelength. However, a new problem that solves tuning of these filters by a temperature change, meets a problem of a insufficient accuracy of dispersion dependences which are used for calculation of transmission at the exact wavelength and the exact temperature. Designing a filter that reaches an extreme small value in its FWHM (e.g. 0.05 nm) it is then very important to determine birefringent dependency with a sufficient accuracy. The paper shows the technique of getting such dependencies, then it mentions a mathematical process suitable for getting the transmission of Solc filter and finally it compares data got from an experiment with computed data.
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Middle-term changes in the lengths of solar cycles
Střeštík, Jaroslav
In the published data of anuual sunspot numbers since 1500 and less reliable guesses of positions of minima and maxima of solar cycles since 200 B.C. middle-term changes in the cycle lenghts have been investigated. Data published by different authors differ considerably, the more the further to the past they go.
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