Direct measurement of the increase in altitude of the soft x-ray emission region during a solar flare

Journal Article · Tue May 15 00:00:00 EDT 1984 · Astrophys. J., Lett. Ed.; (United States)

DOI:https://doi.org/10.1086/184270· OSTI ID:6531719

Seely, J F; Feldman, U

The upward motions of the hot thermal regions of several large (M type) solar flares have been determined from the soft X-ray spectral data recorded by the scanning spectrometer (SOLFLEX) on the P78-1 spacecraft. For the limb flares that are studied, the centroid of the Ca XIX emission region moves to a higher altitude with an apparent speed of 20-40 km s/sup -1/ for a period of 20-30 minutes following onset of the flare and reaches an altitude of 30,000--40,000 km. Although brief periods of downward motion of the emission centroid are observed, substantial decreases in altitude are not observed in any of the flares.

• Research Organization: E. O. Hulburt Center for Space Research, Naval Research Laboratory
• OSTI ID: 6531719
• Journal Information: Astrophys. J., Lett. Ed.; (United States), Vol. 280:2
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SOLAR FLARES
SOFT X RADIATION
CALCIUM
EMISSION SPECTRA
SUN
ALKALINE EARTH METALS
ELECTROMAGNETIC RADIATION
ELEMENTS
IONIZING RADIATIONS
MAIN SEQUENCE STARS
METALS
RADIATIONS
SOLAR ACTIVITY
SPECTRA
STARS
X RADIATION
640104* - Astrophysics & Cosmology- Solar Phenomena