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  • 1980-1984  (5)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Sub-second pulsations simultaneously observed at microwaves and hard X rays in a solar burst (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 317-319 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A solar sub-flare occurred on 4 November 1981 at 18 h 28 min 20 s UT. The associated radio and X-ray bursts, shown in compressed time scale in Fig. la, b, reveal that the correlation of the major burst time structures is poor among the three microwave frequencies, and between microwaves and hard X ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/302317a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Short-period pulsations observed simultaneously by X-ray and radio waves (1983)
    Springer
    Solar physics 86 (1983), S. 237-238 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From simultaneous high-time-resolution observations of solar X-rays from Hinotori and the millimeter waves at Itapetinga Radio Observatory in Brazil during a solar flare on November 4, 1981 at 1827 UT, short period (∼ 300 ms) pulsations have been detected in five time intervals of 2 s each. Both a cross-correlation analysis between X-rays and microwaves and a Fourier analysis were made to verify the significance of the quasi-periodic pulsations. The cross-correlation is significant but the pulsations could not be periodic oscillation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157194
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Estimation of coronal magnetic field from razin effect in solar decametric continuum burst (1980)
    Springer
    Solar physics 68 (1980), S. 339-342 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A solar flare of importance 1B which occurred at 06:36 UT on April 27, 1979 on the solar disk (N 20, E 16) produced intense radio bursts. The most interesting feature of this event is the observation of a strong continuum radiation (type IV) starting at 06:53 UT and lasting for about 10 min in the decametric range. This continuum radiation displayed sharp low frequency cut-off, which varied from about 40 to 30 MHz in a quasiperiodic manner and could be attributed to ‘Razin effect’. The perturbation of this cut-off frequency is interpreted as that induced by the passing MHD shock wave through the region of the trapped energetic electrons. Assuming model electron density values and using the observed cut-off frequency, the magnitude of coronal magnetic field around 2R ⊙ from Sun center works out to be about 6 G.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00156872
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Long time delay between the peaks of intense solar hard X-ray and microwave bursts (1983)
    Springer
    Solar physics 89 (1983), S. 379-390 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that the long time delays more than five seconds between the peaks of intense hard X-ray and microwave bursts are concerned with two independent phenomena. One is the energy dependent time delays in X-rays and the other is the frequency dependent time delays in microwaves. The time delays of 5 s to 10 s between the peaks of solar hard X-ray burst (≲100 keV) obtained with Hinotori spacecraft and microwave burst at 17 GHz were observed exceptionally in three intense events with a spectral maximum at about 17 GHz. It is found that the peak of harder X-rays (≳300 keV) also delays in these events by about the same amount with respect to the softer X-rays (≲100 keV), so that the peak at 17 GHz nearly coincides (≲4s) with that of the harder X-rays. This is quite reasonable because the gyro-synchrotron emissions from the electrons below about 100 keV in the solar flares are generally negligible at high microwave frequencies (≳10 GHz). The optical thickness of the radio source decreases with frequency and is unity generally at about 10–20 GHz in intense bursts as inferred from the radio spectrum. Further delay of the peaks at the lower microwave frequencies is attributed to the temporal increase in the effective size of radio source which is optically thick at the lower frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217257
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Spectral evidence of type ii shock influence on razin-cutoff frequency in the decametric type iv continuum (1983)
    Springer
    Solar physics 84 (1983), S. 285-288 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Bhonsle and Degaonkar (1980) have presented an evidence for the Razin-cutoff frequency in the dkm range of type IV continuum observed by the Ahmedabad spectroscope on 27 April, 1979. They explained this cutoff as due to the Razin effect in the coronal medium. From the broad-band spectrograph at Weissenau, covering 1000 to 30 MHz, additional information on the initial features of type IV is furnished here. This record also confirms the preceeding type II burst, the shock front of which was assumed to produce the quasiperiodicity observed at the lower cut off frequency by interaction with the type IV radiation source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157461
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    Paper (German National Licenses)
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