Temporal Variations of High-Degree Solar p-Modes using Ring-Diagram Analysis

Eclipse on the Coral Sea: Cycle 24 Ascending

物理学;天文学

Burtseva, Olga^1 ; Tripathy, Sushant^1 ; Bogart, Richard^2 ; Jain, Kiran^1 ; Howe, Rachel^3 ; Hill, Frank^1 ; Rabello-Soares, Maria Cristina^4

National Solar Observatory, Tucson, AZ, United States^1

HEPL, Stanford University, CA, United States^2

School of Physics and Astronomy, Edgbaston, Birmingham, United Kingdom^3

Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil^4

关键词: Dopplergrams;    Magnetic activity;    Mode amplitudes;    Ring diagram analysis;    Ring diagrams;    Solar cycle;    Solar p modes;    Temporal variation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/440/1/012027/pdf
DOI  :  10.1088/1742-6596/440/1/012027

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We study temporal variations in the amplitudes and widths of high-degree acoustic modes by applying the ring-diagram technique to the GONG+, MDI and HMI Dopplergrams during the declining phase of cycle 23 and rising phase of cycle 24. The mode parameters from all three instruments respond similarly to the varying magnetic activity. The mode amplitudes and widths show consistently lower variation due to smaller magnetic activity in cycle 24 as compared to the previous solar cycle.