Loading…

Temporal Evolution of the Rotation of the Interplanetary Magnetic Field B x , B y , and B z Components

The daily interplanetary magnetic field (IMF) B x , B y , and B z components from 1967 January 1 to 2018 December 31 listed in the OMNI database are used to investigate their periodicity and study temporal variation of their rotation cycle lengths through continuous wavelet transform, autocorrelatio...

Full description

Saved in:
Bibliographic Details
Published in:The Astrophysical journal 2020-06, Vol.896 (1), p.12
Main Authors: Xiang, N. B., Ning, Z. J., Li, F. Y.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The daily interplanetary magnetic field (IMF) B x , B y , and B z components from 1967 January 1 to 2018 December 31 listed in the OMNI database are used to investigate their periodicity and study temporal variation of their rotation cycle lengths through continuous wavelet transform, autocorrelation, and cross-correlation analyses. The dominant rotation period in each of the daily B x , B y , and B z components is 27.4 days, implying the existence of rotational modulation in the three time series. The dependence of the rotation cycle lengths for both B x and B y components on solar cycle phase almost shows the same result. The rotation cycle lengths for both B x and B y components increase from the start to the first year of a new Schwabe cycle, then decrease gradually from the first to the fourth year, and finally fluctuate around the 27.4-day period within a small amplitude from the fourth year to the end of the Schwabe solar cycle. For the B z component, its rotation cycle length does not show such a solar cycle variation. The significant periods in the variation of B x rotation are 2.9, 3.4, 4.3, 4.9, 10.5, and 11.9 yr, and there exist significant periods of 3.4, 9.9, and 14.1 yr in the variation of B y rotation. The relationship of solar activity with B x and B y components is complex. The possible mechanisms for the temporal variation of the rotation period of the three components are discussed.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab91bc