POLAR GEOMAGNETIC DISTURBANCES

Journal Article · Sun Dec 01 04:00:00 EST 1963 · Planetary Space Sci.

DOI:https://doi.org/10.1016/0032-0633(63)90106-5· OSTI ID:4077094

Nagata, T

Results of recent observations of geomagnetic disturbances in both northern and southern high latitudes are reviewed, and various theories on these phenomena are introduced. A geomagnetic daily variation, observed in the polar areas on magnetically quiet days, is discussed. The morphology of the polar part of the sudden commencement of magnetic storms is described. The morphology of the auroral electrojets is discussed on the basis that they are sporadic and intermittent phenomena. The interrelation among the auroral electrojet intensity, auroral luminosity, and auroral sporadic ionization of the ionosphere is disH03 H0211098 Improvements were made in the measurement of microwave cavity Q. A c-w local oscillator beating against the f-m signal klystron generates a band of beat frequencies. A tunable radio receiver selects the desired narrow band. After shaping by an R-C circuit, this band is used to trigger a pulse generator resulting in a pairof very sharp markers separated by a controllable and accurately measurable amount in frequency. Thus the bandwidth of the cavity characteristic can be accurately determined leading to a much improved Q measurement. Despite the use of thin Al films in low resistance crossings, or the use of poor R-C crossings, no quantum effects were observed in the presence of microwave power. It was noted that magnetic flux was sometimes trapped in the films forming the sample. This resulted in substantial rounding of the sharp corner in the I-V characteristic and care was taken to avoid the effect. The square wave response of a sample operated as a microwave detector was examined up to the limit of the oscilloscope used, less than 1 megacycle. The tunneltron response was found not limiting. Zero-voltage currents associated with the tunneling of electron pairs were observed in all low resistance samples. An a-c technique was used which permitted a demonstration that these currents were not due to superconducting short circuits. (auth)

• Research Organization: Tokyo Univ.
• NSA Number: NSA-18-011095
• OSTI ID: 4077094
• Journal Information: Planetary Space Sci., Journal Name: Planetary Space Sci. Vol. Vol: 11
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AURORAE
BIBLIOGRAPHY
DEFECTS
EARTH
EFFICIENCY
IONIZATION
IONOSPHERE
LIGHT
MAGNETIC FIELDS
PHYSICS
TURBULENCE
VARIATIONS