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Quasi-biennial and Quasi-triennial Oscillations in Geomagnetic Activity Indices : Volume 15, Issue 12 (30/11/-0001)

By Kane, R. P.

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Book Id: WPLBN0003978572
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: Quasi-biennial and Quasi-triennial Oscillations in Geomagnetic Activity Indices : Volume 15, Issue 12 (30/11/-0001)  
Author: Kane, R. P.
Volume: Vol. 15, Issue 12
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
-0001
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Kane, R. P. (-0001). Quasi-biennial and Quasi-triennial Oscillations in Geomagnetic Activity Indices : Volume 15, Issue 12 (30/11/-0001). Retrieved from http://members.worldlibrary.net/


Description
Description: Instituto Nacional de Pesquisas Espacias - INPE, Caixa Postal 515, 12201-970 − São José dos Campos, SP, Brasil. 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 fluctuations are absent near (2–3 y before and after) the sunspot minima and are present only as 2 or 3 peaks in aa indices, one near or before the sunspot maximum and the other (one or two, generally the larger ones) in the declining phase of the sunspot cycle. Comparison with the solar wind (1965 onwards) showed a fairly good match, indicating that the aa variations were mostly due to similar variations in the solar wind, which must have their origin in solar physical processes. A few aa variations did not match with solar wind. When compared with terrestrial phenomena, no match was found with stratospheric low-latitude zonal wind QBO; but some QTO in aa matched QTO in ENSO (El Nino/Southern Oscillation). This may or may not be a chance coincidence and needs further exploration.

Summary
Quasi-biennial and quasi-triennial oscillations in geomagnetic activity indices

 

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