Corrections of Sun-as-a-star p-mode frequencies for effects of the solar cycle

BROOMHALL, A. M., CHAPLIN, W. J., ELSWORTH, Y., FLETCHER, S. T. and NEW, R. (2009). Corrections of Sun-as-a-star p-mode frequencies for effects of the solar cycle. Astronomy and astrophysics, 503 (1), 241-245.

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Abstract

Solar p-mode frequencies vary with solar activity. It is important to take this into account when comparing the frequencies observed from epochs that span different regions of the solar cycle. We present details of how to correct observed p-mode frequencies for the effects of the solar cycle. We describe three types of correction. The first allows mode frequencies to be corrected to a nominal activity level, such as the canonical quiet-Sun level. The second accounts for the effect on the observed mode frequencies, powers, and damping rates of the continually varying solar cycle and is pertinent to frequencies obtained from very long data sets. The third corrects for Sun-as-a-star observations not seeing all components of the modes. Suitable combinations of the three correction procedures allow the frequencies obtained from different sets of data to be compared and enable activity-independent inversions of the solar interior. As an example of how to apply the corrections we describe those used to produce a set of definitive Sun-as-a-star frequencies.

Item Type:	Article
Research Institute, Centre or Group - Does NOT include content added after October 2018:	Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Nanotechnology Centre for PVD Research
Identification Number:	https://doi.org/10.1051/0004-6361/200912286
Page Range:	241-245
Depositing User:	Ann Betterton
Date Deposited:	18 Jun 2010 11:17
Last Modified:	19 Mar 2021 01:00
URI:	https://shura.shu.ac.uk/id/eprint/2015

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