TY - GEN T1 - Time-dependent properties of sunspot groups -- I. Lifetime and asymmetric evolution T2 - arXiv PY - 2021/06/09 AU - Forgács-Dajka E AU - Dobos L AU - Ballai I ED - DO - DOI: 10.48550/arxiv.2106.04917 Y2 - 2025/11/25 ER -