On the outer boundary of the sunspot penumbra

Kálmán, Béla (2002) On the outer boundary of the sunspot penumbra. Solar Physics, 209. pp. 109-117.


Download (176Kb)


Comparison of photographic observations and vector-magnetograph measurements demonstrate that the outer boundary of sunspot penumbra - even in complex sunspot groups - closely follows the 0.075 T iso-gauss line of the total value of the magnetic field, corresponding approximately to the equipartition value in the photosphere. Radio observations also show this feature. The thick penumbra model which interchange convection (Jahn and Schmidt, 1994) gives the best explanation of the penumbral structure.

Item Type: Article
Subjects: Q Science / természettudomány > QB Astronomy, Astrophysics / csillagászat, asztrofizika
Depositing User: Mr András Holl
Date Deposited: 06 Apr 2010 04:59
Last Modified: 30 Nov 2010 14:46

Actions (login required)

View Item View Item