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Multitaper testing of spectral lines and the detection of the solar rotation frequency and its harmonics
Author(s) -
Denison D. G. T.,
Walden A. T.,
Balogh A.,
Forsyth R. J.
Publication year - 1999
Publication title -
journal of the royal statistical society: series c (applied statistics)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.205
H-Index - 72
eISSN - 1467-9876
pISSN - 0035-9254
DOI - 10.1111/1467-9876.00163
Subject(s) - multitaper , harmonics , solar rotation , magnetometer , spacecraft , physics , solar physics , helioseismology , rotation (mathematics) , remote sensing , computational physics , astronomy , geophysics , geodesy , magnetic field , geology , computer science , mathematics , algorithm , geometry , quantum mechanics , voltage
We develop statistical testing methodology for closely spaced spectral lines based on multitaper spectrum estimates and apply it to a time series of solar magnetic field magnitude data recorded by the Ulysses spacecraft. The test is formulated through complex‐valued weighted least squares. Using this test in combination with the test for well‐separated lines, we can accurately detect the solar equatorial rotation frequency of the sun, and its harmonics, from data recorded by Ulysses's magnetometer at solar mid‐latitudes; this is a potentially important result for solar physicists, since it has implications for the structure and dynamics of magnetic fields in the solar corona.