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  • 2010-2014  (13)
  • 1975-1979  (22)
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  • 1
    Electronic Resource
    Electronic Resource
    On some sources of uncertainty in the Lyman-α ionization-rate calculation (1976)
    Springer
    Studia geophysica et geodaetica 20 (1976), S. 273-283 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The effect of the uncertainty and variability in the absorption cross-section, ionization cross-section and the Lyman-α line shape on the Lyman-α ionization-rate calculation is studied. The effect of the variability of the Lyman-α line shape seems to be negligible. The effect of the ionization cross-section is rather small. The greatest and very significant effect, particularly at lower altitudes, is due to the discrepancy in the absorption cross-section data. Some ionospheric and atmospheric consequences are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01601905
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  • 2
    Electronic Resource
    Electronic Resource
    A3 ionospheric absorption measurements at 1538 kHz — first results (1978)
    Springer
    Studia geophysica et geodaetica 22 (1978), S. 390-401 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary A series of absorption measurements covering more than two years, carried out by the A3 method (oblique incidence) on 1538 kHz at the Panská Ves Observatory, is studied. The measuring equipment is shortly described, as well as calibration and the measuring path. Both the diurnal variation of absorption, including its asymmetry, and the seasonal variation of absorption, including the winter anomaly, are observed in a predicted form. The computed height profile of absorption shows that nearly all the absorption is formed in the middle and upper D-region. The 1538 kHz absorption measurements could serve as a very good tool for studying the D-region, but there are still some difficulties attributed to the determination of the zero level of absorption. Suggestions are given how to remove this difficulty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02179280
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  • 3
    Electronic Resource
    Electronic Resource
    Meteorological microseisms and stratospheric warmings (1979)
    Springer
    Studia geophysica et geodaetica 23 (1979), S. 98-100 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The meteorological microseisms recorded at Prague are found to be essentially independent of the occurrence of the major midwinter stratospheric warmings. This finding contributes to studying the downward propagation mechanism of some extraterrestrial influences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01628070
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  • 4
    Electronic Resource
    Electronic Resource
    Diurnal asymmetry in the lower ionosphere — seasonal variability (1978)
    Springer
    Studia geophysica et geodaetica 22 (1978), S. 309-313 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary On the basis of long period measurements of ionospheric absorption in five A3 circuits in Central Europe, it is shown that the considerable seasonal variation of the diurnal asymmetry of absorption, found in[1], exhibits practically no year-to-year variability and is well-developed at equivalent frequencies f eq ≲1 MHz, while it vanishes at F eq ≲2 MHz. The limited data on the diurnal asymmetry of the D-region electron concentration are consistent with the seasonal pattern of the diurnal asymmetry in absorption. A tentative hypothesis of nitric oxide variability as the cause of the seasonal variation of the asymmetry is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01627909
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  • 5
    Electronic Resource
    Electronic Resource
    On the noon asymmetry of the diurnal variation of radio wave absorption (1975)
    Springer
    Studia geophysica et geodaetica 19 (1975), S. 275-281 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The assymetry of the diurnal variation of radio-wave ionospheric absorption, measured by the A3 method on the 2775 kHz Kiel — Panská Ves circuit, is studied. Almost full symmetry of absorption is observed in winter and autumn. It is explained by electron concentration variations. A remarkable diurnal asymmetry of absorption is observed in spring and particularly in summer. The observed diurnal asymmetry of the electron concentration seems to be insufficient to account completely for the great absorption asymmetry observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01614256
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  • 6
    Electronic Resource
    Electronic Resource
    Ionospheric effects of the December 16–18, 1971 geomagnetic storm (1979)
    Springer
    Studia geophysica et geodaetica 23 (1979), S. 263-274 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The post-storm effect (PSE) of the December 16–18, 1971 geomagnetic storm is studied with the use of the ionospheric radio wave absorption measurements and f min data from a network of the GDR, USSR and Czechoslovak observatories. Only a high latitude effect of the storm was found. We found more significant absorption effects associated with later weaker enhancements of geomagnetic activity. The part played by the interplanetary magnetic field is demonstrated. A magnetospheric explanation of the observed variability of PSE based on the time-development of filling up the slot region is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01633917
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  • 7
    Electronic Resource
    Electronic Resource
    Winter anomaly observations at the Panská Ves Observatory (Czechoslovakia), 1971–1973 (1976)
    Springer
    Studia geophysica et geodaetica 20 (1976), S. 404-408 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The results of the winter anomaly observations at the Panská Ves Observatory on 2775 kHz and 2614 kHz (A3 method, feq≈1 and 0.8 MHz) are studied for the winters of 1971/72 and 1972/73. Ionospheric responses to minor (1972) and major stratospheric warmings are found to be different and relatively small. A regular winter-anomaly background absorption increase with a maximum in January was observed during both winters studied. Magnetic storms are found to play an insignificant, if any, role in the winter-anomaly phenomenon. The relation between magnetic activity and ionospheric absorption seems to be better in non-anomalous periods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01617654
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  • 8
    Electronic Resource
    Electronic Resource
    The role of various ionization sources in the A3 lf radio-wave absorption in middle latitudes (1977)
    Springer
    Studia geophysica et geodaetica 21 (1977), S. 403-410 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The 272 kHz ionospheric absorption has been measured at the Průhonice Observatory by the A3 method (oblique incidence) for a long period. The results of the comparison of these absorption data with indices of solar, geomagnetic and cosmic ray activity are presented for large solar zenith angles. The day-time absorption (x ≈ 75° – 85°) is described well by these indices and appears to be affected particularly by direct solar Lyman-α radiation. The night-time absorption (x〉100°), however, is not described sufficiently by the indices used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01613275
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  • 9
    Electronic Resource
    Electronic Resource
    The interplanetary magnetic field sector structure and meteorological microseisms (1977)
    Springer
    Studia geophysica et geodaetica 21 (1977), S. 168-178 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary Meteorological microseisms, recorded at the Prague seismic station and, similarly, at other Central Europe stations, reflect certain meteorological situations in the North Atlantic frontal zone. Meteorological elements in this zone are affected by some factors of extra-terrestrial origin, among others by the interplanetary magnetic field (IMF) sector structure. The analysis of the 68 IMF sector boundary passage effects in microseismic activity, expressed in microseismic amplitudes, showed a well-developed minimum of microseismic activity on the day of the boundary passage in winter, but no such effect in spring and autumn. In spring and autumn, however, a tendency was observed to slightly higher microseismic activity in the “away” (+) sector, whereas no such tendency was observed in winter. These results agree with the IMF effect found in the troposphere. Generally, the IMF sector structure is only a modulating rather than a major factor controlling the microseismic activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01634828
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  • 10
    Electronic Resource
    Electronic Resource
    SEA and SDA measurements at panská VES — peculiar Events (1979)
    Springer
    Studia geophysica et geodaetica 23 (1979), S. 359-367 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The results of the twelve-year (1962–1973)SEA (27 kHz) andSDA (5 kHz) measurements at the Panská Ves Observatory are presented with an emphasis on peculiar events. About half of allSIDs are observed asSEA events and about 10% asSDAs. NoSID has been observed only as anSDA. A fewSIDs have been observed asSEA only, most of them being probably of non-solar origin. A few events observed asSEA andSDA only, or as anSID withSDA, but withoutSEA, are briefly discussed, too.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01633241
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