Transition region oscillations in sunspots

Details Transition region oscillations in sunspots Transition region oscillations in sunspots

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253..939g&link_type=abstract

Astrophysical Journal, Part 1, vol. 253, Feb. 15, 1982, p. 939-948.

Astronomy and Astrophysics

Astrophysics

93

Solar Atmosphere, Solar Oscillations, Stellar Spectrophotometry, Sunspots, Atmospheric Turbulence, Carbon, Oxygen, Polarimeters, Radiant Flux Density, Resonance Lines, Solar Maximum Mission, Solar Spectrometers, Spectral Resolution, Temporal Resolution, Ultraviolet Spectrometers

Scientific paper

Time series observations of the profile of the C IV resonance line 1548.19 A obtained in eight sunspots with the Ultraviolet Spectrometer and Polarimeter (UVSP) on the Solar Maximum Mission are discussed. All of the sunspots exhibit significant oscillations in line-of-sight velocity with frequencies in the range from 5.8 mHz to 7.8 mHz (periods of 129-173 s). Significant intensity oscillations are observed at the same periods in four of the time series; the maximum intensity is in phase with maximum blueshift. Difference spectroheliograms ('Dopplergrams') of the two halves of the C IV line, as well as observations in the Si IV resonance line 1402.77 A and the O IV intersystem line 1401.16 A, also reveal velocity oscillations at similar frequencies but only over sunspots.

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