An assessment of winds data (60–110 km) obtained in real-time from a medium frequency radar using the radio wave drifts technique

1982 ◽  
Vol 44 (8) ◽  
pp. 649-655 ◽  
Author(s):  
J.B. Gregory ◽  
C.E. Meek ◽  
A.H. Manson
Keyword(s):  
Radio Wave ◽  
Real Time ◽  
Medium Frequency

A microcomputer-based real-time data system for radio wave propagation studies

1986 ◽  
Vol 9 (3) ◽  
pp. 223-231
Author(s):  
Ahmed Sharaf Eldin ◽  
Mohammed A. Alhaider ◽  
Adel A. Ali
Keyword(s):  
Wave Propagation ◽  
Radio Wave ◽  
Real Time ◽  
Data System ◽  
Radio Wave Propagation ◽  
Time Data ◽  
Real Time Data

Climatologies of mean winds and tides observed by medium frequency radars at Tromsø (70°N) and Saskatoon (52°N) during 1987–1989

1991 ◽  
Vol 69 (8-9) ◽  
pp. 966-975 ◽  
Author(s):  
A. H. Manson ◽  
C. E. Meek
Keyword(s):  
Real Time ◽  
Theoretical Models ◽  
Temperature Gradients ◽  
Medium Frequency ◽  
Partial Reflection ◽  
Modal Composition ◽  
The Mean ◽  
Data Yield ◽  
Partial Reflection Radar ◽  
Mf Radar

A real-time winds system from Saskatoon has operated with the Tromsø medium frequency (MF) (partial reflection) radar (70°N, 20°E) since mid-1987. Although the system has a poorer data yield than usual, owing to smaller receiving antennas, it has proven possible over 2 years to obtain 12 month climatologies of mean winds and tides (70–75 to 100 km) with a 10 d resolution. These are compared with similar products from the Saskatoon MF radar (52°N, 107°W). The mean winds and tides generally show similar seasonal morphologies. However the mean winds are weaker, consistent with smaller meridional temperature gradients. Also, there are significant changes in the tidal wavelengths and amplitudes suggesting that considerable adjustments of modal composition have occurred. The tides are compared with recent numerical-theoretical models.

scholarly journals Isolated lower mesospheric echoes seen by medium frequency radar at 70° N, 19° E

2006 ◽  
Vol 6 (12) ◽  
pp. 5307-5314 ◽  
Author(s):  
C. M. Hall ◽  
A. H. Manson ◽  
C. E. Meek ◽  
S. Nozawa
Keyword(s):  
Radio Wave ◽  
Solar Proton ◽  
Necessary Condition ◽  
Total Absorption ◽  
Medium Frequency ◽  
Vhf Radar ◽  
Proton Fluxes ◽  
D Region ◽  
Mf Radar

Abstract. We have noted sporadic instances of strong isolated reflections of medium frequency (MF) radar waves from the mesosphere from as low as 50 km altitude and have devised a set of criteria for isolating these apparently anomalous echoes from those normally occurring from progressive partial reflections in the D-region. The object of this study is to map the occurrences of such echoes facilitating comparisons with other observations. For example, the similarity and simultaneity of the echo structure for the 20 January 2005 with VHF radar results presented by Lübken et al. (2006) are particularly striking. In presenting a number of such echo events since 2001 selected from the MF radar dataset (which spans 1997 to present), we find that virtually all echo occurrences coincide with enhanced solar proton fluxes suggesting that substantial ionisation of the mesosphere is a necessary condition. Strong partial reflections of the radio wave in the lower mesosphere combined with seasonally varying total absorption higher up, thus giving false impressions of lower mesospheric layers preferentially in winter, constitute a scenario consistent with our observations.

scholarly journals Comprehensive methodology for identifying incompatible radioelectronic facilities in a grouping

2017 ◽  
pp. 25-31
Author(s):  
A. V. Pilkov ◽  
A. N. Radomskiy
Keyword(s):  
Wave Propagation ◽  
Radio Wave ◽  
Real Time ◽  
Electromagnetic Compatibility ◽  
Radio Wave Propagation ◽  
Basic Data ◽  
Radio Interference ◽  
Electromagnetic Environment ◽  
Characteristic Features ◽  
To Receive

The study introduces comprehensive methodology for identifying incompatible radioelectronic facilities in a grouping, with provision for the effect of radio interference of various types operating in different spatial directions. The research also focuses on the characteristic features of radio-wave propagation in the area where radioelectronic facilities are used. In view of the results obtained, it is possible to determine a plan for ensuring electromagnetic compatibility when designing radioelectronic facilities. Moreover, findings of the research allow us in real time to receive data on radio electronic facilities which have harmful interference impact, in the presence of basic data on real electromagnetic environment in the area where radioelectronic facilities are used.

scholarly journals Isolated lower mesospheric echoes seen by medium frequency radar at 70° N, 19° E

2006 ◽  
Vol 6 (4) ◽  
pp. 7407-7426
Author(s):  
C. M. Hall ◽  
A. H. Manson ◽  
C. E. Meek ◽  
S. Nozawa
Keyword(s):  
Radio Wave ◽  
Solar Proton ◽  
Necessary Condition ◽  
Total Absorption ◽  
Medium Frequency ◽  
Vhf Radar ◽  
Proton Fluxes ◽  
D Region ◽  
Mf Radar

Abstract. We have noted sporadic instances of strong isolated reflections of medium frequency (MF) radar waves from the mesosphere from as low as 50 km altitude and have devised a set of criteria for isolating these apparently anomalous echoes from those normally occurring from progressive partial reflections in the D-region. The object of this study is therefore to map the occurrences of such echoes facilitating comparisons with other observations. For example, the similarity and simultaneity of the echo structure for the 20 January 2005 with VHF radar results presented by Lübken et al. (2006) are particularly striking. In presenting a number of such echo events since 2001 selected from the MF radar dataset (which spans 1997 to present), we find that virtually all echo occurrences coincide with enhanced solar proton fluxes suggesting that substantial ionisation of the mesosphere is a necessary condition. Strong partial reflections of the radio wave in the lower mesosphere combined with seasonally varying total absorption higher up, thus giving false impressions of lower mesospheric layers preferentially in winter, constitute a scenario consistent with our observations.

scholarly journals VLF LIGHTNING DIRECTION FINDER

2019 ◽  
pp. 95-104
Author(s):  
Г.И. Дружин ◽  
В.М. Пухов ◽  
Д.В. Санников ◽  
Е.И. Малкин
Keyword(s):  
Electromagnetic Field ◽  
Wave Propagation ◽  
Electromagnetic Radiation ◽  
Radio Wave ◽  
Real Time ◽  
Magnetic Components ◽  
Direction Finder ◽  
Academy Of Sciences ◽  
Far Eastern ◽  
Cosmophysical Research

Для исследования мощных электромагнитных излучений от гроз в Институте космофизических исследований и распространения радиоволн ДВО РАН создан ОНЧ пеленгатор, способный записывать сигналы электрических и магнитных компонент электромагнитного поля, определять направления прихода излучений в реальном времени. С помощью ОНЧпеленгатора на Камчатке исследованы эффекты, связанные с грозовыми источниками. For the study of powerful electromagnetic radiation from thunderstorms, a VLF direction finder was created at the Institute of Cosmophysical Research and Radio Wave Propagation of the Far Eastern Branch of the Russian Academy of Sciences, capable of recording signals of electrical and magnetic components of the electromagnetic field, and determining the direction of radiation arrival in real time. With the help of VLF direction finder in Kamchatka, the effects associated with thunderstorm sources are investigated.

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