Publisher
Springer Science and Business Media LLC
Subject
Space and Planetary Science,Astronomy and Astrophysics
Reference31 articles.
1. Antalová, A.: 1971, The ratio of penumbral and umbral areas of sun-spots in the 11-year solar activity cycle. Bull. Astron. Inst. Czechoslov.
22, 352.
ADS
.
2. Baranyi, T., Győri, L., Ludmány, A.: 2016, On-line tools for solar data compiled at the Debrecen observatory and their extensions with the Greenwich sunspot data. Solar Phys.
291, 3081.
DOI
.
ADS
.
3. Beck, J.G., Chapman, G.A.: 1993, A study of the contrast of sunspots from photometric images. Solar Phys.
146, 49.
DOI
.
ADS
.
4. Brandt, P.N., Schmidt, W., Steinegger, M.: 1990, On the umbra–penumbra area ratio of sunspots. Solar Phys.
129, 191.
DOI
.
ADS
.
5. Carrasco, V.M.S., Vaquero, J.M., Trigo, R.M., Gallego, M.C.: 2018, A curious history of sunspot penumbrae: An update. Solar Phys.
293, 104.
DOI
.
ADS
.
Cited by
10 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献