TY - JOUR AU - P. Wilson BT - Solar Physics DA - Jan-03-1968 DO - 10.1007/BF00171619 PY - 1968 SP - 454 EP - 465 T2 - Solar Physics TI - The structure of a sunspot II: The Magnetohydrodynamics of the Penumbra UR - http://www.springerlink.com/index/pdf/10.1007/BF00171619 VL - 3 SN - 0038-0938 ER -