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  • 1
    Electronic Resource
    Electronic Resource
    A high resolution study in time, position, intensity, and frequency of the radio event of January 14, 1971 (1973)
    Springer
    Solar physics 30 (1973), S. 473-488 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A high resolution study in time, frequency, position, and intensity was made at 169 MHz and neighbouring frequencies of the solar radio event of 1971, January 14, 11h 20m–30m UT. The event consisted of two closely resembling groups of type III bursts and type II like details. Before, during, and after the outburst a stationary type IV continuum was seen, with small amplitude pulsating structure. The size of the pulsating structure (which was located inside the continuum) was considerably smaller than the continuum size, and in agreement with an explanation by fluctuating magnetic inhomogeneities inside the continuum source. The continuum moved outward after each outburst at a high speed (2–4000 km s−1). After the second event the continuum source returned inward slowly (≈ 450 km s−1). The outward motion is discussed. It can be explained by a combination of the impact of a fast magnetohydrodynamic shock and the injection of highly energetic particles during the event, the required number being also necessary to account for the observed radio flux. The slow returning motion can be related to mhd restoring of the magnetic field configuration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152677
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  • 2
    Electronic Resource
    Electronic Resource
    Chains of type I stormbursts (1976)
    Springer
    Solar physics 48 (1976), S. 321-337 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From radio spectra between 160 and 320 MHz of chains of type I bursts it appears that their duration distributions allow an exponential fit, and that those of samples containing long and short chains respectively, taken from the same storm, have virtually the same characteristic time (logarithmic slope). On the average this figure decreases - as a function of the frequency - at about 1 s per 10 MHz. The high frequency cut-off of chain activity (noise storms) is mainly a consequence of the frequency dependence of the probability for the first burst of a chain to appear. Given the density of type I bursts in a chain, it is concluded that the probability of a type I burst to be followed by another one is at least 90% below 250 MHz and 70–80% at 300 MHz, which makes it essential for type I theories to include a mechanism to this effect. The drift rate distribution for chains is symmetrical with a peak at-10 MHz/s. The statistics is indicative of a correlation between drift rate and duration. No evidence has been found for the occurrence of chain pairs or frequency splitting in chains, nor for an association between chains and type III bursts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151999
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  • 3
    Electronic Resource
    Electronic Resource
    Millisecond microwave spikes in a solar flare (1978)
    [s.l.] : Nature Publishing Group
    Nature 275 (1978), S. 520-521 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Reconstruction for Ha flare, 2B, N19W54, of the total power recording of 2,650 MHz flux observed at Dwingeloo (2) compared with that of 2,800 MHz flux observed at A.R.O. (1) (courtesy M. B. Bell at A.R.O., Ottawa). Data reconstructed from a logarithmic channel. The period of strong ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/275520a0
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  • 4
    Electronic Resource
    Electronic Resource
    Book reviews (1993)
    Springer
    Space science reviews 62 (1993), S. 393-399 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196125
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  • 5
    Electronic Resource
    Electronic Resource
    Peculiar absorption and emission microstructures in the type IV solar radio outburst of March 2, 1970 (1972)
    Springer
    Solar physics 25 (1972), S. 210-231 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The high resolution dynamic spectrogram between 320 and 160 MHz of the Type IV event which started at 13∶35 UT on the 2nd of March 1970 shows a remarkable richness of absorption-emission microstructures. These are morphologically analyzed into structure elements and patterns. The elements are normal and reversed intermediate drift bursts, which we call fiber bursts, medium band shortlived absorptions, broadband shortlived absorptions, broadband wedge shaped absorptions and a, sofar unknown, type which we call tadpole. The patterns are the pulsating structure, sequences of broadband shortlived absorptions, and patterns of almost parallel lines which we call zebra patterns. During the event a border frequency of about 230 MHz plays an important part, most clearly as a low frequency cut-off for the tadpole zebrapattern and as a zone of phase change in the pulsating structure. The macrostructure of this event, shown in a composite dynamic spectrogram, reveals features in the decimetric wavelength region that are related with the appearance of tadpole patterns in the region between 220 and 320 MHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00155758
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  • 6
    Electronic Resource
    Electronic Resource
    Fiber bursts concurrent with a weak noise storm (1976)
    Springer
    Solar physics 46 (1976), S. 247-252 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new kind of radio burst is described and identified as quasi-fiber burst according to some striking similarities with fiber bursts. Its interpretation is discussed in terms of Kuijpers' whistler model and an explanation for a broken variety of. the observed burst is given. The derived magnetic field strength in the source is 4 G at a plasma level of 300 MHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157571
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  • 7
    Electronic Resource
    Electronic Resource
    X-ray, Hα, and radio observations of the two-ribbon flare of 16 May, 1981 (1983)
    Springer
    Solar physics 89 (1983), S. 355-378 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper is a contribution to the study of two-ribbon flares. A variety of observational material, i.e. Hα pictures, radio spectrum in the frequency band of 150–1000 MHz, radio map at 6 cm, fluxes at other frequencies, magnetograms and X-ray flux in a broad energy interval, enabled us to study the development of the 16 May, 1981 flare. The onset of the flare could be described by the model of Van Tend and Kuperus. A diminishing of the magnetic shear during the activation of the filament was observed. From radio and X-ray data it was found that pulsed acceleration took place in the region under the rising filament, the electrons propagating in a limited region both upwards to greater heights and downwards into the footpoints. Internal oscillations of the filament were observed. A manifestation of the primary process of interplanetary shock-wave generation was found. The 6 cm radio sources could be localized in the footpoints of magnetic loops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217256
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  • 8
    Electronic Resource
    Electronic Resource
    Fine structure in solar microwave bursts (1990)
    Springer
    Solar physics 130 (1990), S. 183-199 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have designed and constructed a new multi-channel radio spectrograph for the study of short-lived structures in solar microwave bursts. It measured the integrated flux over the whole solar disc in two circular polarizations at 36 frequencies between 4 and 8 GHz, with a time constant of 0.5 ms. We have analyzed all 119 recorded bursts observed in 1981 and 1983. We focused our attention on events with a lifetime of less than 1 s. Fine structure occurs in about 30% of the observed bursts, and can be as rich in detail as in bursts observed at lower frequencies. We found at least four different classes of events. In one event neither bandwidth nor time resolution of the receiver appear to be sufficient to resolve the fine structure. The bulk of the drifts is found to be towards higher frequencies. Periodic flux variations were found in two cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00156789
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  • 9
    Electronic Resource
    Electronic Resource
    The relation between the surges and solar radio emission (1982)
    Springer
    Solar physics 77 (1982), S. 277-283 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The 120 limb surges which have been observed by means of Wrocław Observatory coronagraph from September 1966 to November 1977 are investigated. The evolution of surges was compared with the radio data during the surges. A correlation between radio bursts and the surges was found, particularly with chains of type I radio bursts, which is the first reliable correlation found of these bursts with non-radio events. The type I correlation only applied for surges without accompanying flare, of which 43% are correlated with this type of radio emission. In 23 of 30 associated events the start of a surge coincided within 5 minutes with the start or an enhancement of the type I storm. If flares were present, the association was not significant. We also compared the maximum height reached by a surge with the frequencies of the radio bursts emitted at the same time and the maximum velocity of the rising surge with the frequency drift of type I chains. No such a correlation was however found. We discuss the possibility that surges are the result of a sudden energy input into the chromosphere related to the type I source in the corona.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00156110
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  • 10
    Electronic Resource
    Electronic Resource
    Book reviews (1986)
    Springer
    Space science reviews 43 (1986), S. 383-396 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190640
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    Paper (German National Licenses)
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