text: Soft gamma repeaters and AXP objects are thought to be stars characterized by high values of this variable according to a theory of Robert Duncan.
full_question: Soft gamma repeaters and AXP objects are thought to be stars characterized by high values of this variable according to a theory of Robert Duncan. The death valley for pulsars occurs when this variable goes below a value defined by period. This value for the corona has been inferred from distance between flux ropes and bow shock in CMEs. The splitting of astrophysical hydroxyl masers can be used to measure this quantity due to the Zeeman effect. For 10 points name this quantity, generated by the dynamo effect, which is characteristically enormous for magnetars.
first_sentence: Soft gamma repeaters and AXP objects are thought to be stars characterized by high values of this variable according to a theory of Robert Duncan.