The frequency spectrum of variations of the BZ component of the interplanetary magnetic field
Abstract
IMF data for 19631974 are used to analyze the frequency structure of variations of the vertical Bz component. Time series of mean monthly values of Bz were used to identify highfrequency components of the spectrum (periods less than 50 days), and the maximum entropy method was used to calculate the mean spectral estimate for 19661972. It is shown that the highest amplitudes have harmonics with periods of 1214.3 and 7.48.3 days, which is probably a manifestation of the IMF sector structure. A comparison with known spectra of variations of the solar coronal line at 5303 A, the Kp index, and the intensity of solar cosmic rays indicates that variations with periods close to periods of the revolution of the inner planets about the sun or their integer combinations are significant in solarterrestrial relationships.
 Publication:

Investigation of the HighLatitude Ionosphere and Magnetosphere of the Earth
 Pub Date:
 1982
 Bibcode:
 1982ihli.book..142K
 Keywords:

 Interplanetary Magnetic Fields;
 Magnetic Variations;
 Secular Variations;
 Solar Terrestrial Interactions;
 Amplitude Distribution Analysis;
 Geomagnetism;
 Magnetic Field Configurations;
 Maximum Entropy Method;
 Planetary Rotation;
 Solar Cosmic Rays;
 Solar Spectra;
 Spectrum Analysis;
 Time Series Analysis;
 Astrophysics