Quasi-biennial oscillation in geomagnetic disturbance field
نویسندگان
چکیده
منابع مشابه
Quasi-biennial and quasi-triennial oscillations in geomagnetic activity indices
Data for geomagnetic activity index aa for 1868±1994 were subjected to spectral analysis for 12 intervals each of 11 consecutive years. In each interval, QBO and QTO (quasi-biennial and quasi-triennial oscillations) were observed at 2:00, 2.15, 2.40, 2.70 y and 3:20, 3.40 y, but not all in all intervals. These ̄uctuations are absent near (2±3 y before and after) the sunspot minima and are presen...
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The modulation of the vertical flux of kinetic energy to the stratosphere by the pressure-work effect at 100 mb is compared with variations in the hemispheric kinetic cnergy, the horizontal momentum and heat transports a t “low” latitudes, and the tropical zonal wind and temperature for the lower stratosphere. It is deduced that the variation of the vertical flux of geopotential is in phase wit...
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Daily data at 16 stations along five latitudes from 13"N. to 33"s. were carefully examined a t the 50-, lo&, and 500-mb. levels for evidence of longitudinal phase progression of the quasi-biennial oscillation (&BO). At 50 mb. there is evidence of west to east progression although there are many irregularities and much uncertainty. The phase dates differ by days a t low latitudes. At 100 and 500...
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The period of the quasi-biennial oscillation is examined through the use of a harmonic procedure which allows one to examine periods of interest without omission of any data. On the basis of 8, and 5th years, of mean-monthly zonal-wind and temperature data in the Northern and Southern Hemispheres, respectively, it is found that: (1) A quasi-biennial oscillation in zonal-wind exists in the tropo...
متن کاملLength-of-Day Variations Caused by El Nino-Southern Oscillation and Quasi-Biennial Oscillation.
Two prominent interannual atmospheric fluctuations, the El Niño-Southern Oscillation in the troposphere-ocean system and the Quasi-Biennial Oscillation in the equatorial stratosphere, account for most of the observed interannual length-of-day (LOD) variation from 1964 through 1987, with a relative contribution of about 2 to 1. Thus the atmosphere-LOD connection extends from seasonal and shorter...
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ژورنال
عنوان ژورنال: Journal of Earth System Science
سال: 1985
ISSN: 0253-4126,0973-774X
DOI: 10.1007/bf02863406