Independent Global Modes of Solar Magnetic Field Fluctuations

被引：0
作者：
A. C. Cadavid
J. K. Lawrence
D. P. McDonald
A. Ruzmaikin
机构：
[1] California State University,Department of Physics and Astronomy
[2] California Institute of Technology,Jet Propulsion Laboratory
来源：
Solar Physics | 2005年 / 226卷
关键词：
Magnetic Field; Time Series; Spatial Variation; High Latitude; Characteristic Time;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Observed solar, interplanetary and geomagnetic time series contain quasi periodicities on scales of 1–2.5 years. The further discovery of 1.3 year fluctuations in helioseismic observations suggests that a variety of signals may be related to the underlying dynamo in the Sun. We use independent component analysis to study the temporal and spatial variations of a few statistically independent global modes of the axisymmetric solar magnetic field over a period of 25 years. Five modes capture the salient properties of the data. Two modes describe the polar and high latitude fields, and present 1–1.5 year quasi periodicities. The other three modes correspond to low and mid-latitude phenomena and show both 1.3 and 1.7-year variations. By comparing the characteristic time scales, dates of occurrence and heliocentric latitudes of these modes, we connect them to their manifestations in heliospheric time series.
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页码：359 / 376
页数：17
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