Vertical motions in quiescent prominences observed in the He i lambda 10830A line

Technical Report · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6952932

Engvold, O; Keil, S L

Movies of quiescent prominences seen in H/sub A/ show apparent downflow of matter. The effect is confirmed by observations of downflows in the Ca II K line from large filaments/prominences. Several recent studies show evidence for the opposite case from observations in H/sub A/, i.e., that there is a predominantly upward directed flow in prominences seen on the disk. The quoted results are slightly ambiguous because the observed Ca II K and H/sub A/ line shifts can be severely influenced by displacements of the chromospheric component of the line and by the line opacity and source function which generally are not well known. This problem is discussed in connection with measurements of chromospheric velocities. Velocity fields in solar prominences are discussed.

• Research Organization: Air Force Geophysics Lab., Hanscom AFB, MA (USA)
• OSTI ID: 6952932
• Report Number(s): AD-A-193922/2/XAB; AFGL-TR-88-0078
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKALINE EARTH METALS
ATMOSPHERES
CALCIUM
CHROMOSPHERE
ELEMENTS
FILAMENTS
FLUIDS
GASES
HELIUM
INFRARED SPECTRA
METALS
NONMETALS
OPACITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RARE GASES
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR FLARES
SOLAR PROMINENCES
SPECTRA
VELOCITY