Solar oscillations in cycle 24 ascending

Eclipse on the Coral Sea: Cycle 24 Ascending

物理学;天文学

Jain, Kiran^1 ; Tripathy, Sushanta^1 ; Hill, Frank^1 ; Larson, Timothy^2

National Solar Observatory, Tucson, AZ 85719, United States^1

Stanford University, Stanford, CA 94305, United States^2

关键词: Activity index;    Intermediate degree;    Magnetic activity;    Mode frequencies;    Model-based OPC;    Solar activity;    Solar oscillations;    Strong correlation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/440/1/012023/pdf
DOI  :  10.1088/1742-6596/440/1/012023

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Solar oscillation frequencies are known to follow the trend of solar cycle and show a strong correlation with various activity indices. However, the extended minimum between cycles 23 and 24 has raised several questions on the correlation between frequencies and solar activity where frequencies with different mode sets sensed different minima. In this paper, we analyze intermediate-degree mode frequencies as the Sun emerges from the unusually long period of minimal magnetic activity to study their behaviour with activity indices and compare results with the corresponding phase of cycle 23. We show that a model based on the rising phase of cycle 23 is a good predictor for behaviour in the rising phase of cycle 24.