Analysis of the 27.03 day Period found in Synoptic Data from NSO-Kitt Peak

Details Analysis of the 27.03 day Period found in Synoptic Data from NSO-Kitt Peak Analysis of the 27.03 day Period found in Synoptic Data from NSO-Kitt Peak

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp51b04h&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP51B-04

Physics

7511 Coronal Holes, 7524 Magnetic Fields, 7536 Solar Activity Cycle (2162)

Scientific paper

Over 25 years of synoptic data from the NSO-Kitt Peak Vacuum Telescope (KPVT) is used to investigate recent reports of a 27.03 day period observed in solar wind and solar surface magnetic field data. We present analysis of this signal using time series of integrated KPVT full-disk measurements of the magnetic flux in 868.8 nm and the line equivalent width in 1083.0 nm. In particular, we analyze the coherency of the 27.03 day signal, along with a search for potential solar surface sources of the signal. As a measure the coherency, a phase coherency spectrum was created using the signal phase measured for different segments of the time series. For comparison, we also analyze the international sunspot number (ISN) for the same period as the KPVT time series, along with the full period of the ISN time series. Similar to earlier results, we find that the signal is coherent for the last few decades but not over longer time periods. By constructing maps of the surface distribution of activity synchronized to different rotation periods, we find that the origin of the signal is long-lived complexes of active regions. This research was supported in part by the Office of Navel Research Grant N00014-91-J-1040. The NSO-Kitt Peak data used here are produced cooperatively by NSF/AURA, NASA/GSFC, and NOAA/SEC.

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