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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
    Do CRISTA Experiment/Campaign Data Represent a Typical Situation or Not? (1997)
    Springer
    Studia geophysica et geodaetica 41 (1997), S. 171-180 
    Details
    ISSN: 1573-1626
    Keywords: CRISTA ; lower ionosphere ; radio wave absorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Abstract Data from four A3 radio wave circuits in central Europe are used to analyse the representativeness of the ionization and gravity wave activity pattern in the lower ionosphere (∼85 – 100 km) in the CRISTA experiment interval (3 – 12 November 1994) for the given conditions. It has been found that the CRISTA experiment interval was run under conditions, which are highly representative both of October – November 1994 and autumn, low-moderate solar activity, the descending phase of solar cycle conditions, i.e. CRISTA measurements may be considered to provide values identical with, or close to climatological values (at least for central Europe, h = 85 – 100 km).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1023388628983
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  • 5
    Electronic Resource
    Electronic Resource
    Do Solar Flares Affect Total Ozone? (1998)
    Springer
    Studia geophysica et geodaetica 42 (1998), S. 533-539 
    Details
    ISSN: 1573-1626
    Keywords: total ozone ; lower ionosphere ; solar flares
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Abstract An analysis of total ozone from Hradec Králové (50.25°N, 15.21°E) and of radio wave absorption in the lower ionosphere at 1539 kHz (reflection point 50.3°N, 11.8°E) shows that there is no detectable effect of strong solar flares in total ozone, no correlation between total ozone and absorption on a day-to-day time scale, and that strong solar flares do not affect this correlation. Thus the long-term correlation of monthly average values (Alberca et al., 1996) is not reproduced on a day-to-day time scale, and the effects of strong geomagnetic storms in total ozone (Laštovička et al., 1992; Mlch and Laštovička, 1996) have no counterpart in effects of strong solar flares.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1023353306498
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of the IMF sector boundaries on cosmic rays and tropospheric vorticity (1987)
    Springer
    Studia geophysica et geodaetica 31 (1987), S. 213-218 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Description / Table of Contents: Summary The effect of the IMF sector boundary crossing (IMF SBC) in the vorticity area index (VAI) — the well-known dip in the VAI after IMF SBC — is found to be independent of the IMF SBC effect in the cosmic ray flux. This finding refutes a recent suggestion by Lundstedt [1] that the IMF SBC effect in VAI is caused by a decrease in cosmic ray flux, but supports the concept of the IMF SBC effects in the ionosphere and atmosphere developed by Laštovička [2–4]. Cosmic rays seem to affect the troposphere in another way.
    Notes: Резюме Воз¶rt;еŭсmвuе nересеченuя секmорноŭгрaнuцы межnлaнеmного мaгнumного nоля (ПСГ ММП) нa uн¶rt;екс nлощa¶rt;u зaвuхренносmu (ИПЗ) — общеuзвесmныŭ мuнuмум в ИПЗ nосле ПСГ ММП — нaŭ¶rt;ено незaвuсuмым оm эффекma ПСГ ММП в nоmоке космuческuх лучеŭ. Эmоm резульmam оnровергaеm не¶rt;aвное nре¶rt;ложенuе Лун¶rt;сmе¶rt;a [1], чmо эффекm ПСГ ММП в ИПЗ вызвaн nонuженuем nоmокa космuческuх лучеŭ, но nо¶rt;¶rt;ержuвaеm концеnцuю эффекmов ПСГ ММП в uоносфере u amмосфере, рaзвumую Лaшmовuчкоŭ [2–4]. Кaжеmся чmо космuческuе лучu могуm влuяmь нa mроnосферу ¶rt;ругuм обрaзом.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01638205
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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    The response of the total electron content to the interplanetary magnetic sector boundary crossing (1980)
    Springer
    Studia geophysica et geodaetica 24 (1980), S. 60-64 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Резюме Иссле¶rt;уюmся uзмененuя nолного со¶rt;ержaнuя элекmронов вблuзu nересеченuŭ секmорныхгрaнuц межnлaнеmного мaгнumного nоля. Эmu uзмененuя срaвнuвaюmся с сооmвеmсmвующuмu uзмененuямu ¶rt;ругuх uоносферных naрaмеmров. Нaблю¶rt;aеmся рaзлuчuе меж¶rt;у uзмененuямu nолного со¶rt;ержaнuя элекmронов в невозмущенных u возмущенных условuях. Тaкое рaзлuчuе не нaблю¶rt;aеmся в nоглощенuu на чaсmоmе 245 кгц. Пре¶rt;лaгaеmся uнmерnреmaцuя некоmорых нaблю¶rt;aнных uзмененuŭ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01628381
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  • 9
    Electronic Resource
    Electronic Resource
    On the role of solar Lyman alpha radiation in radio-wave absorption in theD-region (1983)
    Springer
    Studia geophysica et geodaetica 27 (1983), S. 85-99 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Резюме Срaененuе uзмеренuŭ nоглощенuя рa¶rt;оволн нa чaсmоmе 2775 кГц (меmо¶rt; АЗ, Кuль — Пaнскa Вес, f екв =1 мГц) со сnуmнuковымu uзмеренuямu солнечного лaŭмaн aльфa u ренmгеновского uзлученuя в леmнuх сезонaх 1969, 1970 u 1972го¶rt;ов nокaзaло, чmо лaŭмaн aльфa uзлученuе ясно nреоблa¶rt;aеm в nолгощенuu в невсnышечных условuях. Ренmген uгрaеm сущесmвенную роль mолько в uзменчuвосmu nоглощенuя. Оnmuмaльные урaвненuя ¶rt;aюm nроnорцuонaльносmь L ∼ F иониз m , m=1,1−1,5 (ме¶rt;uaнные знaченuя зaвuсящuе оm х). Прuмененuе nоnрaвкu ренmгеновскuх ¶rt;aнных nо [18] nовышaеm роль ренmгенa в nоглощенuнuu, но некоmорые ¶rt;ругuе резульmamы, кaк знaченuя m, nочmu не зaвuсяm оm nоnрaвкu. Прuво¶rt;яmся оценкu некоmорых крumuческuх уровнеŭ влuянuя ренmгенa нa nоглощенuе u эффекma солнечного цuклa. Резульmamы uмеюm облaсmь nрuмененuя в nрогнозuровaнuu nоглощенuя u в aэрономuu нuжнеŭ uоносферы (оценкu NО um¶rt;.).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01630747
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  • 10
    Electronic Resource
    Electronic Resource
    Diurnal asymmetry of radio wave absorption on anomalous winter days (1982)
    Springer
    Studia geophysica et geodaetica 26 (1982), S. 313-315 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Резюме Анaлuз uзмеренuя nо лощенuя рa¶rt;uоволн нa З чaсmоmaх зa nерuо¶rt; 1966–1981 nокaзaл, чmо в сре¶rt;нем, незaвuсuмо оm mо о, еслu основное nо лощенuе зuмоŭ выше ¶rt;о uлu nосле nолу¶rt;ня, ¶rt;оnолнumельное nо лощенuе в aномaльных ¶rt;нях все ¶rt;a выше nосле nолу¶rt;ня. В эmом смысле зuмнuе aномaльные ¶rt;нu блuже леmнuм условuям.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01635040
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