Some Remarks on the Statics and Dynamics of Magnetic Field Structure Development in Active Regions [chapter]

V. Bumba, J. Suda
1971 Solar Magnetic Fields  
Some comments are given concerning the fine structures in the umbra and penumbra of sunspots and their changes on the basis of high resolution photographs.
doi:10.1007/978-94-010-3117-2_25 fatcat:f2uwypczprgvzjaud4jwc532hm