Perturbations in the wave parameters near active regions

Eclipse on the Coral Sea: Cycle 24 Ascending

物理学;天文学

Rabello-Soares, M.C.^1 ; Bogart, R.S.^2 ; Scherrer, P.H.^2

Physics Department, Universidade Federal de Minas Gerais, MG 30380, Belo Horizonte, Brazil^1

W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305, United States^2

关键词: Acoustic oscillation;    Active regions;    Doppler data;    Functional forms;    Mode amplitudes;    Ring diagram analysis;    Wave characteristics;    Wave parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/440/1/012008/pdf
DOI  :  10.1088/1742-6596/440/1/012008

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

The wave characteristics derived from ring-diagram analysis of HMI Doppler data in magnetically quiet regions near active regions are compared with those with no nearby active regions using 5°patches during 2.5 years of cycle 24 ascending phase. We search for perturbations that may be associated with propagation of the acoustic oscillations through the nearby sunspot. We observe significant variations in the mode parameters and flows. We analyse their dependence on the direction of the wave propagation. The observed mode dependence of the variations in mode amplitude, line width and frequency does not have the same functional form as that observed for the differences between quiet and active regions.