Quasi-biennial cycle in indices of geomagnetic and solar activity

Details Quasi-biennial cycle in indices of geomagnetic and solar activity Quasi-biennial cycle in indices of geomagnetic and solar activity

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ge%26ae..26..789n&link_type=abstract

Geomagnetizm i Aeronomiia (ISSN 0016-7940), vol. 26, Sept.-Oct. 1986, p. 789-792. In Russian.

Computer Science

3

Geomagnetism, Solar Cycles, Solar Terrestrial Interactions, Amplitudes, Long Term Effects, Phase Deviation, Solar Activity, Sunspots

Scientific paper

A quasi-biennial cycle (QBC) with a mean duration of 26 months is found in the Sigma Kp and AA geomagnetic indexes and in Wolf numbers. The cycle has the form of a relatively wide band with periods from 21 to 29 months with different amplitudes and phases. The QBC in geomagnetism and Wolf numbers is nonstationary: its components vary in amplitude and phase over the entire 100-year observation period. In addition, a weak correlation is found between filtered values of Wolf numbers and the geomagnetic activity indices, indicating a QBC.

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