Results are reported for a study of the slow modes of solar prominence dynamics based on examination of daily maps of H-alpha activity, a set of daily X-ray photographs of the sun, H-alpha pictures taken at 5-min intervals, and synoptic maps of neutral lines. It is found that both the presence and the dynamics of prominences related to X-ray cavities depend on the age of the associated neutral line. Long-lasting and large prominences are shown to be associated with middle-aged neutral lines, while transient and small prominences are observed to occur in X-ray structures that are disturbed either by rapid evolution, as in young field lines, or by decreasing intensity of the field characterizing older structures. The results indicate that the lack of material within an X-ray cavity in no case seems to balance the prominence material, so that some chromospheric material is necessary for prominence formation.

Dynamical Behaviour of Coronal Cavities, Prominences Material and Magnetic Fields

MOTTA, Santo;PIRRONELLO, Valerio;
1978-01-01

Abstract

Results are reported for a study of the slow modes of solar prominence dynamics based on examination of daily maps of H-alpha activity, a set of daily X-ray photographs of the sun, H-alpha pictures taken at 5-min intervals, and synoptic maps of neutral lines. It is found that both the presence and the dynamics of prominences related to X-ray cavities depend on the age of the associated neutral line. Long-lasting and large prominences are shown to be associated with middle-aged neutral lines, while transient and small prominences are observed to occur in X-ray structures that are disturbed either by rapid evolution, as in young field lines, or by decreasing intensity of the field characterizing older structures. The results indicate that the lack of material within an X-ray cavity in no case seems to balance the prominence material, so that some chromospheric material is necessary for prominence formation.
1978
CORONAL HOLES; SOLAR X-RAYS; SOLAR PROMINENCES
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/247553
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