Radio Observations of Two Large Solar Disturbances

1951 ◽  
Vol 4 (1) ◽  
pp. 51
Author(s):  
JV Hindman ◽  
AG Little ◽  
R Payne-Scott ◽  
DE Yabsley ◽  
CW Allen
Keyword(s):  
Radio Frequency ◽  
Solar Flares ◽  
Radio Frequency Power ◽  
Frequency Range ◽  
Power Flux ◽  
Apparent Position ◽  
Radio Receivers ◽  
Solar Origin ◽  
Solar Disturbances ◽  
Frequency Power

On February 17 and 21-22, 1950, two exceptionally large radio-frequency disturbances of solar origin were observed on seven radio receivers working in the frequency range from 62 to 9400 Mc/s. At each of the frequencies the radio-frequency power flux was recorded continuously during the disturbance and at several frequencies the polarization of the radiation was examined. The apparent position of the origin of the radiation was determined at one frequency. The time of commencement and the duration of the disturbances at the different frequencies were compared with each other and with those of associated phenomena, solar flares, radio fade-outs, and geomagnetic effects. The two disturbances show marked similarities and marked differences ; these are summarized.

scholarly journals The nuclear moment of the indium atom

1931 ◽  
Vol 133 (821) ◽  
pp. 333-335 ◽  
Keyword(s):  
Radio Frequency ◽  
Power Amplifier ◽  
Discharge Tube ◽  
Ultra Violet ◽  
Radio Frequency Power ◽  
Nuclear Moment ◽  
Frequency Range ◽  
Sheet Copper ◽  
Screen Grid ◽  
Frequency Power

The investigation described here is a continuation of an earlier one carried out by two of the authors in which certain lines in the first spark spectrum of indium were studied and the conclusion drawn that the nuclear moment of that atom was probably ½ h /2π. During the time that elapsed between the completion of this work and its publication there appeared a paper by Jackson describing an examination of certain lines in the arc spectrum which led to an I value of unity. Two of the lines λ4511, λ4102 observed by him had appeared on our plates and been measured by us, the structure recorded in the two cases being quite different. In proceeding with the research it was therefore decided first to revise the work on these lines and then to direct our attention to lines in the ultra-violet region of the arc spectrum. The discharge tube used was very similar to Jackson’s. It was made from quartz and consisted of two wide portions 8 cm. in length and 2·5 cm. in diameter joined by a narrower one 4 cm. in length and 0·8 cm. in diameter. The electrodes were made of sheet copper wrapped around the wide parts of the tube and were coupled inductively to an oscillating circuit with a frequency range of 10,000 to 14,000 cycles. Two U. V. 861 General Electric screen grid radio frequency power amplifier tubes operating in parallel were used. A small amount of indium trichloride (Hilger’s H. S. brand) was introduced into the tube, which was then evacuated. It was usually necessary to heat the tube slightly by means of a bunsen to start the discharge, but once this was done no further heating was necessary.

scholarly journals High performance metal–insulator–graphene diodes for radio frequency power detection application

Nanoscale ◽  
2017 ◽  
Vol 9 (33) ◽  
pp. 11944-11950 ◽  
Author(s):  
Mehrdad Shaygan ◽  
Zhenxing Wang ◽  
Mohamed Saeed Elsayed ◽  
Martin Otto ◽  
Giuseppe Iannaccone ◽  
...  
Keyword(s):  
Radio Frequency ◽  
High Performance ◽  
Radio Frequency Power ◽  
Metal Insulator ◽  
Frequency Power

Metal–insulator–graphene diodes are proved to be able to deliver high performance, and meanwhile are suitable for radiofrequency power detection.

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