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Phase and amplitude asymmetry in the quasi-biennial oscillation of solar Halpha flare activity
- Publication Year :
- 2019
-
Abstract
- Quasi-biennial oscillation (QBO) of solar magnetic activities is intrinsic to dynamo mechanism, but still far from fully understood. In this work, the phase and amplitude asymmetry of solar QBO of Hα flare activity in the northern and southern hemispheres is studied by the ensemble empirical mode decomposition, the cross-correlation analysis, and the wavelet transform technique. The following results are found: (1) solar QBO of Hα flare index in the two hemispheres has a complicated phase relationship, but does not show any systematic regularity; and (2) the solar cycle mode of solar Hα flare index in the northern hemisphere generally leads that in the southern one by nine months for the time interval from 1966 to 2014. The possible origin of these results is discussed.
- Subjects :
- 010504 meteorology & atmospheric sciences
FOS: Physical sciences
Astrophysics
01 natural sciences
law.invention
Physics::Geophysics
law
0103 physical sciences
Astrophysics::Solar and Stellar Astrophysics
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
Quasi-biennial oscillation
Physics
Solar flare
Oscillation
Northern Hemisphere
Astronomy and Astrophysics
Amplitude
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
Physics::Space Physics
H-alpha
Astrophysics::Earth and Planetary Astrophysics
Dynamo
Flare
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....06c4fc522d74b0fd0f57ee9cb83e01c8