Effects of gravity and planetary waves on the lower ionosphere as obtained from radio wave absorption measurements

2001 ◽  
Vol 26 (6) ◽  
pp. 381-386 ◽  
Author(s):  
J. Laštovička
Keyword(s):  
Radio Wave ◽  
Lower Ionosphere ◽  
Planetary Waves ◽  
Wave Absorption ◽  
Radio Wave Absorption ◽  
Absorption Measurements

Some possibilities of predicting radio wave absorption in the lower ionosphere

1986 ◽  
Vol 30 (1) ◽  
pp. 87-92
Author(s):  
Josef Boška ◽  
Jan Laštovička ◽  
L. Křivský
Keyword(s):  
Radio Wave ◽  
Lower Ionosphere ◽  
Wave Absorption ◽  
Radio Wave Absorption

Studies of Radio-Wave Absorption Features at a Subauroral Latitude

1971 ◽  
Vol 49 (11) ◽  
pp. 1411-1418
Author(s):  
M. A. Abdu ◽  
E. L. Vogan
Keyword(s):  
Radio Wave ◽  
The South ◽  
Wave Absorption ◽  
The North ◽  
Noise Absorption ◽  
Radio Wave Absorption ◽  
Cosmic Noise ◽  
Absorption Features ◽  
Absorption Measurements

Cosmic noise absorption measurements at 30 MHz were made simultaneously on two antennas having different beam widths at London, Ontario(53 °N geomagnetic, L = 3.1), a subauroral zone station. The data show that absorption is caused by regions of ionization which exhibit marked spatial non-uniformity within the antenna beams, and which have horizontal extensions limited more toward the south than toward the north of the station. The measurements also indicate the presence of auroral ionization at all times of the day over London.

scholarly journals Relationship between the Radio Wave Absorption and Horizontal Winds in the Lower Ionosphere over East Siberia.

1995 ◽  
Vol 47 (6) ◽  
pp. 539-549 ◽  
Author(s):  
G. V. Vergasova ◽  
E. S. Kazimirovsky ◽  
V. D. Kokourov ◽  
V. F. Petruchin
Keyword(s):  
Radio Wave ◽  
Lower Ionosphere ◽  
East Siberia ◽  
Wave Absorption ◽  
Radio Wave Absorption

scholarly journals Quasi-five- and ten-day oscillations in f0F2 and their possible connection with oscillations at lower ionospheric heights

1996 ◽  
Vol 39 (4) ◽  
Author(s):  
D. Altadill ◽  
J. Lastovicka
Keyword(s):  
Seasonal Variation ◽  
Statistical Analysis ◽  
Solar Cycle ◽  
Radio Wave ◽  
Central Europe ◽  
Lower Ionosphere ◽  
Relative Amplitude ◽  
Wave Absorption ◽  
Radio Wave Absorption ◽  
Degree Of Similarity

The statistical analysis of the 5-day and 10-day oscillations inferred in the upper and lower ionosphere in Central Europe from f0F2 measured in Pruhonice and the radio wave absorption in the lower ionosphere shows a remarkable degree of similarity for relative amplitudes of oscillations (not for absolute amplitudes). The relative amplitudes in both regions do not express a significant solar cycle effect and their seasonal variation is also similar except for winter. The typical relative amplitude of both 5- and 10-day oscillations in the F2-region is about 4%, which is useful information for PRIME.

scholarly journals Trends in the characteristics of the annual and semiannual variations observed in the radio wave absorption in the lower ionosphere

1999 ◽  
Vol 17 (10) ◽  
pp. 1336-1343 ◽  
Author(s):  
J. Laštovička ◽  
D. Pancheva
Keyword(s):  
Radio Wave ◽  
Lower Thermosphere ◽  
Lower Ionosphere ◽  
Positive Trend ◽  
Continuous Increase ◽  
Wave Absorption ◽  
Yearly Average ◽  
Radio Wave Absorption ◽  
Long Term Trends

Abstract. The continuous increase in concentration of greenhouse gases in the atmosphere is expected to cool higher levels of the atmosphere. There is some direct and indirect experimental evidence of long-term trends in temperature and other parameters in the mesosphere and lower thermosphere (MLT). Here we look for long-term trends in the annual and semiannual variations of the radio wave absorption in the lower ionosphere, which corresponds to the MLT region heights. Data from central and southeastern Europe are used. A consistent tendency to a positive trend in the amplitude of the semiannual wave appears to be observed. The reality of a similar tendency in the amplitude of the annual wave is questionable in the sense that the trend in the amplitude of the annual wave is probably induced by the trend in the yearly average values of absorption. The phases of both the annual and semiannual waves display a forward tendency, i.e. shift to an earlier time in the year. A tentative interpretation of these results in terms of changes of the seasonal variation of temperature and wind at MLT heights does not contradict the trends observed in those parameters.Key words. Ionosphere (ionosphere – atmosphere interactions; mid-latitude ionosphere) · Meteorology and atmospheric dynamics (middle atmosphere dynamics)

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