Report
Multicomponent Activity Cycles using Hilbert-Huang Analysis
| العنوان: | Multicomponent Activity Cycles using Hilbert-Huang Analysis |
|---|---|
| المؤلفون: | Velloso, E. N., Anthony, F., Nascimento Jr, J. D. do, Silveira, L. F. Q., Hall, J., Saar, S. H. |
| المصدر: | The Astrophysical Journal Letters, Volume 945, Issue 1, id.L12, 2023 |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | The temporal analysis of stellar activity evolution is usually dominated by a complex trade-off between model complexity and interpretability, often by neglecting the non-stationary nature of the process. Recent studies appear to indicate that the presence of multiple coexisting cycles in a single star is more common than previously thought. The correct identification of physically meaningful cyclic components in spectroscopic time series is therefore a crucial task, which cannot overlook local behaviors. Here we propose a decomposition technique which adaptively recovers amplitude- and frequency-varying components. We present our results for the solar activity as measured both by the sunspot number and the $K$-line emission index, and we consistently recover the Schwabe and Gleissberg cycles as well as the Gnevyshev-Ohl pattern probably related to the Hale cycle. We also recover the known 8-year cycle for 61 Cygni A, in addition to evidence of a three-cycles long pattern reminiscent of the Gnevyshev-Ohl rule. This is particularly interesting as we cannot discard the possibility of a relationship between the measured field polarity reversals and this Hale-like periodicity. Comment: 8 pages, 3 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/2041-8213/acb8b4 |
| URL الوصول: | http://arxiv.org/abs/2310.16974 |
| رقم الانضمام: | edsarx.2310.16974 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/2041-8213/acb8b4 |
|---|