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  • 11
    Electronic Resource
    Electronic Resource
    On the transformation of planetary waves of tropospheric origin into waves in radio wave absorption in the lower ionosphere (1994)
    Springer
    Studia geophysica et geodaetica 38 (1994), S. 71-81 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary Calculations are carried out of upward propagation of a tropospherically forced 10-day planetary wave into the upper middle atmosphere with the use of the COMMA-R model of the University of Cologne, of its transformation into a wave in electron density by means of the model of the Comenius University, and of its final transformation into a wave in radio wave absorption in the lower ionosphere applying the computer code of the Geophysical Institute. The calculations show that the absorption may be used for investigating the planetary wave activity, particularly of its long-term trends. The possibility of propagation of planetary waves from the winter hemisphere to the summer hemisphere is illustrated, which could contribute to explanation of the occurrence of travelling planetary waves in the mesosphere in summer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02296254
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  • 12
    Electronic Resource
    Electronic Resource
    Trends in planetary wave activity in the upper middle atmosphere inferred from the nighttime LF radio wave absorption measurements (1994)
    Springer
    Studia geophysica et geodaetica 38 (1994), S. 206-212 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The nighttime LF radio wave absorption in the lower ionosphere measured at two frequencies in central Europe over 1963–1985 is used to infer planetary wave activity and its long-term trend in the upper middle atmosphere (∼90–100 km). The observed positive trend is roughly consistent with results based on daytime absorption. Nighttime results are less pronounced and less statistically significant probably due to perturbing effects of geomagnetic activity. The observed trends, which are probably of anthropogenic origin, are together with the daytime results [3,4] the first evidence of long-term trends in planetary wave activity in the upper middle atmosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02295914
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  • 13
    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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  • 14
    Electronic Resource
    Electronic Resource
    A3 ionospheric absorption measurements on 1539 kHz at Panská Ves (1982)
    Springer
    Studia geophysica et geodaetica 26 (1982), S. 381-388 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Резюме Прuво¶rt;яmся резульmamы uзмеренuŭ uносферного nоглощенuя рa¶rt;uоволн меmо¶rt;омА3 (нaклонное na¶rt;енuе) нa чaсmоmе 1539 кГц нa обсервamорuu Пaнскa Вес зa nерuо¶rt; мaрm 1978 — aвгусm 1981г. u mоже оnuсaнuе nрuемного усmроŭсmвa. Нaблю¶rt;aеmся ожu¶rt;aемaя суmочнaя (включaя aсuмеmрuю) u сезоннaя вaрuaцuя nоглощенuя, явленuе зuмнеŭ aномaлuu u внезanные uоносферные возмущенuя. Эксnерuменmaльные u рaсчеmные знaченuя nоглощенuя ¶rt;ля χ=60° хорощо совna¶rt;aюm. Анaлuз nокaзaл, чmо nрu больщuх зенumных углaх солнцa ¶rt;aнные ¶rt;осmоверны зa весь nерuо¶rt;, nрu мaлых mолько nосле включенuя оnuсaнного nрuемного усmроŭсmвa в aвгусmе 1980г.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01639639
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  • 15
    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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  • 16
    Electronic Resource
    Electronic Resource
    Trends in planetary wave activity inferred from Hungarian radio wave absorption measurements (1995)
    Springer
    Studia geophysica et geodaetica 39 (1995), S. 420-424 
    Details
    ISSN: 1573-1626
    Keywords: Lower ionosphere ; planetary waves ; long-term trends
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The nighttime and sunset LF radio wave absorption measured at Nagycenk, western Hungary over 1967–1991 is used to infer planetary wave activity and its long-term trend in the upper middle atmosphere (∼85 – 100 km). The very moderate positive and mostly statistically insignificant trends are consistent with the pattern provided by previous analyses of various day- and night-time absorption measurements. The trends could be of anthropogenic origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02295895
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  • 17
    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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  • 18
    Electronic Resource
    Electronic Resource
    Long-period fluctuations observed in the ionospheric absorption variations (1987)
    Springer
    Studia geophysica et geodaetica 31 (1987), S. 301-314 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Description / Table of Contents: Summary By subsequent application of power spectrum analysis, autocorrelation analysis and fast Fourier transform (FFT) of the day- and night-time absorption values of five LF radio-paths (164 kHz, 155 kHz, 185 kHz, 218 kHz and 272 kHz) in Europe during the interval 1 June 1979–30 June 1980, fluctuations with the following basic (fundamental), commonly recurrent periods were found: 3.5–5 days and 10.5–12 days. They exist in all investigated time series, while 6- and 9-day fluctuations are observed on the northern radio-paths (185 kHz and 272 kHz). Shorterperiod oscillations are most active during autumn and especially during winter, while the longerperiod oscillation (10.5–12-day) has significant amplitudes also in summer.
    Notes: Резюме С nомощыо nосле¶rt;овamельно о nрuмененuя aнaлuзa сnекmрa мощносmu, aвmокорреляцuонно о aнaлuзa u бысmроŭ Фурье mрaнсформaцuu (БФТ) к ¶rt;невным u ночным ¶rt;aнным nо nо лощенuю uз nяmu НЧ рa¶rt;uо mрaсс (164 кГц, 155 кГц, 185 кГц, 218 кГц u 272 кГц) нa¶rt; Евроnоŭ в nерuо¶rt; 1 uюня 1979–30 uюня 1980 . былu нaŭ¶rt;ены сле¶rt;ующuе основные (фун¶rt;aменmaльные) nовmоряющuеся nерuо¶rt;ы: 3.5–5 ¶rt;неŭ u 10.5–12 ¶rtнеŭ. Онu nрuсрmсmвуюm во всех uссле¶rt;овaнных временных ря¶rt;aх. 6- u 9-суmочные колебaнuя нaблю¶rt;aюmся mолько в более северных рa¶rt;uоmрaссaх (185 кГц u 272 кГц). Плaнеmaрные колебaнuя сaмые aкmuвные осенью u осенью u особенно зuмоŭ. Более ¶rt;ол оnерuо¶rt;ные волны (10.5–12 ¶rt;неŭ) uмеюm знaчumельную aмnлumу¶rt;у u леmом.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01624760
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  • 19
    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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  • 20
    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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