Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...273..374g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 273, Oct. 1, 1983, p. 374-380.
Astronomy and Astrophysics
Astrophysics
28
Chromosphere, Flow Velocity, Magnetohydrodynamic Flow, Solar Corona, Sunspots, Umbras, Doppler Effect, Resonance Lines, Solar Maximum Mission, Spatial Resolution
Scientific paper
Doppler velocity measurements in the C IV resonance line λ1548.19 have been obtained over the umbrae of eight sunspots with the Ultraviolet Spectrometer and Polarimeter (UVSP) on the Solar Maximum Mission. The velocity bandpass of these observations is approximately ±30 km s-1, and their spatial resolution is 3" × 3". Although a few individual resolution elements display flow velocities ∼ ±15 km s-1 relative to the quiet network, we measure a mean upflow of (1.2 ± 5.6) km s-1 when averaged over all the resolution elements. Means over individual umbrae frequently show smaller variances, which is evidence for a real distribution of umbral transition region velocity fields.
We also examine two possible explanations for the smaller nonthermal broadening of the sunspot C IV line.
Athay Grant R.
Gurman Joe B.
No associations
LandOfFree
Fluid motions in the solar chromosphere-corona transition region. IV - Mass motions over sunspot umbrae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Fluid motions in the solar chromosphere-corona transition region. IV - Mass motions over sunspot umbrae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluid motions in the solar chromosphere-corona transition region. IV - Mass motions over sunspot umbrae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1192549