Aliased Low-Frequency Modes in Solar Radio Noon Flux Data

Details Aliased Low-Frequency Modes in Solar Radio Noon Flux Data Aliased Low-Frequency Modes in Solar Radio Noon Flux Data

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh23b0371m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH23B-0371

Physics

1872 Time Series Analysis (3270, 4277, 4475), 3270 Time Series Analysis (1872, 4277, 4475), 4277 Time Series Experiments (1872, 3270, 4475), 4475 Scaling: Spatial And Temporal (1872, 3270, 4277)

Scientific paper

We consider eighteen years of RSTN solar radio noon flux data, collected by four terrestrial observation stations during the years 1989-2006, as compiled by the NGDC. We apply multitaper techniques to test for the presence of modes(pure harmonic components) in the signals captured at each station, and we calculate the intra-station coherence. Coherences were computed for both pairs of observation stations with approximately 12-hour longitudinal time differences. Despite the fact that the Sun cannot be observed simultaneously at both stations, we observe strong coherences. In common with similar data, the phase of the coherence varies in a complicated way. The phase departs from the linear trend expected from the time delay between observation stations; we show these differences are much larger than jackknifed phase error estimates. Because the data are daily samples of an unfiltered process, they can be aliased. We show that the observed phase variations can be explained as being the phase for the true (unaliased) frequency components and not the apparent (aliased) ones. Using the known time differences between stations and phase estimates allows us to identify the aliased modes. We show that most of the coherent (and apparently low-frequency) modes, are likely to be aliases of higher frequency modes.

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