0124611 - ASU-R 20000067 RIV DE eng J - Článek v odborném periodiku
Sobotka, Michal - Brandt, P. N. - Simon, G. W.
Fine structure in sunspots. III. Penumbral grains.
Astronomy & Astrophysics. Roč. 348, č. 2 (1999), s. 621-626. ISSN 0004-6361. E-ISSN 1432-0746
Grant CEP: GA AV ČR IAA3003903; GA AV ČR KSK1003601
Výzkumný záměr: CEZ:AV0Z1003909
Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
Impakt faktor: 2.252, rok: 1999

There appears to be a dividing line in the penumbra, approximately 0.7 of the distance from the umbra to the photosphere, such that most PGs outside this line move toward the photosphere, and those inside move toward the umbra.
Trvalý link: http://hdl.handle.net/11104/0022870