Asymmetric Line Profiles Applied to Gong Helioseismic Data

Details Asymmetric Line Profiles Applied to Gong Helioseismic Data Asymmetric Line Profiles Applied to Gong Helioseismic Data

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp21c04l&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP21C-04

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7522 Helioseismology

Scientific paper

P-mode frequencies have traditionally been fit using a symmetric Lorentzian profile. Due to clear asymmetries in the peaks, researchers have begun moving toward asymmetric near-Lorentzian profiles; amongst the most popular is the Nigam profile. In this paper, results are presented from a fit of the Nigam profile to two datasets, both taken from GONG data, using a new peak fitting engine (PEAKFIND Mark II). Details of PEAKFIND Mark II are presented. Results of the Nigam model fits are compared with those achieved using a symmetric Lorentzian line profile (those reported by the GONG network). Results are also shown to be largely consistent with other published fits in the low frequency region.

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