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  • 1
    Electronic Resource
    Electronic Resource
    Basic Component of Solar Radio Emission at Centimetre and Decimetre Wave-Lengths (1965)
    [s.l.] : Nature Publishing Group
    Nature 208 (1965), S. 739-741 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT is now well established that at centi- and decimetre wave-lengths the solar radio emission, apart from the more rapidly varying features like bursts of various types, consists of: (1) a basic component remaining constant over a considerable period of time; (2) a slowly varying component showing ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/208739a0
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  • 2
    Electronic Resource
    Electronic Resource
    Wide-band average spectra of solar radio bursts (1980)
    Springer
    Solar physics 67 (1980), S. 109-120 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Peak flux spectra of solar radio bursts in a wide frequency band have been statistically determined for different morphological types of bursts, for various ranges of magnetic field of the burst-associated sunspots and also for the bursts occurring in the central and limb region of the solar disk. Important results obtained are: (i) The generalised spectra have two peaks, one near to meter-wave and the other in the centimeter-wave region, the former peak being more pronounced than the latter; (ii) identical spectral shape is observed for the great and impulsive types and also for GRF and PBI types of bursts; (iii) the radio emission intensity is relatively higher in the central part than that in the limb part of the solar disk for frequencies 1–10 GHz, while the reverse is true for frequencies 0.245–1 GHz and 10–35 GHz; (iv) the optical depth of the absorbing layer above the source of a burst is found to be the same for meter to centimeter-wavelength bursts, implying that the radio sources in this wide band have uniform characteristics with respect to optical thickness; (v) in case of simultaneous emission in the dekameter to X-ray band, most of the decimetric bursts are seen to be very prompt and coincident with the associated flare's starting time. The interpretations of the obtained spectra give an insight into the possible generation mechanisms, pointing to the location of the source region in the solar atmosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00146687
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  • 3
    Electronic Resource
    Electronic Resource
    Spectrum of average flux of the S-component of solar radio emission (1971)
    Springer
    Solar physics 18 (1971), S. 276-283 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Spectrum of average flux of the S-component of solar radio emission observed during the peak phase of the present solar cycle has been determined statistically. Daily values of the mean solar flux at 606, 1415, 2695, 4995 and 8800 MHz observed at the Sagamore Hill Solar Radio Observatory have been examined. The superposed epoch method (Chree analysis) has been used for determining the true nature of the S-component at all these frequencies. Spectrum has been obtained after elimination of the basic components at the respective frequencies. The important results obtained from the present statistical investigation are: (1) the basic component increases with frequency, (2) the S-component shows a maximum at 4995 MHz (∼6 cm), (3) the spectrum is independent of the phase of the 27-day cycle and (4) S-components at all the frequencies have slopes which are both more uniform and higher in the ascending phase than those in the descending phase of the 27-day cycle. In the descending phase slopes increase with frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145942
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  • 4
    Electronic Resource
    Electronic Resource
    Some studies on the solar microwave bursts in relation to the slowly varying component (1972)
    Springer
    Solar physics 26 (1972), S. 378-385 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The occurrences of 5772 microwave bursts recorded by the Sagamore Hill and Manilla Solar Radio Observatories over the period January 1968 to July 1970, covering the maximum phase of the current solar cycle at frequencies 2695, 4995 and 8800 MHz and their energy excesses have been examined in relation to the S-component of solar radio emission. The average slowly varying component has been determined by the superposed epoch method commonly known as the Chree analysis. Similar treatment of the bursts, data, mentioned above has been made to examine any probable 27-day variation and the results obtained have been compared with that of the S-component. Further, spectra of the microwave bursts under the so-called spectral type - ‘inverted U’, particularly those having a peak at 4995 MHz, have also been examined and compared with the average spectrum of the S-component. Some of the important results obtained from the present analysis are: (1) the nature of variation of both the average number of occurrences and energy excesses of the microwave bursts follow in general the average 27-day variation of the S-component, (2) the number of occurrences and energy excesses of the microwave bursts are comparatively greater in the ascending phase of the 27-day cycle than those in the descending phase, (3) bursts at progressively higher frequencies originate at lower levels in the solar atmosphere than those of the associated S-component, and (4) the average spectrum of the microwave bursts of ‘inverted U’ spectral type having a peak at 4995 MHz is quite identical in nature to that of the S-component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00165279
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  • 5
    Electronic Resource
    Electronic Resource
    Some studies on Hα-flares and microwave bursts in relation to sunspot magnetic configurations (1977)
    Springer
    Solar physics 51 (1977), S. 409-412 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Sunspot associated Hα-flares and microwave bursts occurring during the period 1972 to 1974 have been examined in relation to the magnetic strength and configurations of the sunspots and sunspot groups (abbreviated as ‘spots’). Important results obtained are: (i) percentage occurrences of flares exceeds those of microwave bursts up to a magnetic field strength of 2000 G while the reverse is true for higher field strength of ‘spots’, (ii) flare productivity (average number of flares per spot) and also burst productivity are comparatively higher in the case of ‘βγ’ and ‘δ’ types of spots than in the case of other types of spots, (iii) the above productivities are predominantly high when magnetic configuration of ‘spots’ changes during their life time, and (iv) ‘impulsive’ type of microwave bursts are more associated with ‘spots’ having ‘changing type’ of magnetic configuration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00216375
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  • 6
    Electronic Resource
    Electronic Resource
    Distribution of sunspots according to their magnetic fluxes (1982)
    Springer
    Solar physics 78 (1982), S. 67-70 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The occurrence frequency distribution of sunspots in different magnetic flux values has been examined. The number of sunspots decreases as φ-1.9 for sunspots with magnetic flux greater than 3 × 1021 Maxwell, where φ is the said flux of a sunspot.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151143
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  • 7
    Electronic Resource
    Electronic Resource
    A comparative study of Hα-flares of different visual features in relation to radio bursts and sunspots (1979)
    Springer
    Solar physics 64 (1979), S. 323-328 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solar Hα-flares now reported with their distinctive visual features have been statistically examined for a period of about eight years in relation to their different characteristics, flare-burst and flare-sunspot association. Important results obtained are: (i) Integrated intensity changes from the highest to the lowest values in the order F, H, E, and D flare type, whereas, impulsiveness in the order H, F, E, and D type, (ii) Flare-burst association is frequency dependent and is highest and lowest for H and D types respectively in almost all the frequencies, (iii) Most of the flares of D, E, and F types are associated with sunspots of β p , α p , and δ configurations having field strength 1500–2500 G, while that of H type with β p and β configurations having field strength 1000–2000 G.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151442
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  • 8
    Electronic Resource
    Electronic Resource
    Fine Structure of the Extra-terrestrial Radio Source Cygnus I (1953)
    [s.l.] : Nature Publishing Group
    Nature 172 (1953), S. 996-997 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The investigation has been made on a frequency of 125 Mc./s. with an interferometer which has been described elsewhere1'4'5. It measures the variation of the correlation function p2 with the aerial separation in terms of wave-lengths (JV), where and F sin ty and F cos ty are the sine and cosine ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/172996a0
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  • 9
    Electronic Resource
    Electronic Resource
    Irregularities in the Solar Atmosphere (1966)
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 168-169 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Solar radio noise has been observed systematically at various frequencies since 1947. It has been revealed from these observations that radio emission from the Sun consists of three components: (a) a basic component (B component) from the completely undisturbed Sun, (b) a slowly varying component ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/212168a0
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  • 10
    Electronic Resource
    Electronic Resource
    Slowly Varying Component of Solar Radio Emission in Relation to the Solar Cycle (1964)
    [s.l.] : Nature Publishing Group
    Nature 203 (1964), S. 626-627 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. The curves showing the relation of the variation index with frequency for the years 1957 (), 1958 (), 1959 (), I960 (), 1961 (), 1962 (O) and 1963 () The method of analysis adopted in the present case is similar to the earlier one referred to above. In that analysis plots of the daily mean ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/203626a0
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