Structure and oscillations in quiescent filaments from observations in He I wavelength 10830 A

Technical Report · Mon Dec 31 23:00:00 EST 1990

OSTI ID:5314414

Zhang, Y; Engvold, O; Keil, S L

Observations of two quiescent filaments show oscillatory variations in Doppler shift and central intensity of the He I Solar 10830 Angstroms line. The oscillatory periods range from about 5 to 15 min. with dominant periods of 5, 9, and 16 min. The possibility that the oscillations are Alfven waves is discussed. The Doppler signals of the filament form fibril-like structures. The fibrils are all inclined at an angle of about 25 degrees to the long axis of the filament. The magnetic field has a similar orientation relative to the major direction of the filament, and the measured Doppler signals are apparently produced by motions along magnetic flux tubes threading the filament.

• Research Organization: Phillips Lab., Hanscom AFB, MA (United States)
• OSTI ID: 5314414
• Report Number(s): AD-A-234406/7/XAB
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALFVEN WAVES
DOPPLER EFFECT
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUID MECHANICS
FLUIDS
GASES
HELIUM
HYDRODYNAMICS
HYDROMAGNETIC WAVES
INFRARED RADIATION
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETOHYDRODYNAMICS
MECHANICS
MORPHOLOGY
NONMETALS
OSCILLATIONS
RADIATIONS
RARE GASES
SOLAR ACTIVITY
SOLAR PROMINENCES
SPECTRA