Chromospheric And Transition Region Dynamics - Reasons and Consequences of the Short Period Instrumental Periodicities of SOHO/SUMER

Details Chromospheric And Transition Region Dynamics - Reasons and Consequences of the Short Period Instrumental Periodicities of SOHO/SUMER Chromospheric And Transition Region Dynamics - Reasons and Consequences of the Short Period Instrumental Periodicities of SOHO/SUMER

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..579r&link_type=abstract

8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

The instrumentally caused oscillations of the spectral lines intensity and velocity, determined with the SUMER spectrometer onboard SoHO, are presented. On examples of two long-term measurements of O I, C II and O VI lines, it is shown that the reason of this instrumental effect was the insufficient precision of the solar rotation compensation of the spectrometer slit position. In both observational runs the standard rotation compensation procedure, performed on-line by the instrument, was selected for the long-term observations. The minor periodical motion of the slit position on the solar disk was taking place during such observations and this effect produced the regular changes of the measured line intensities and velocities. The significant enhancements of the oscillations amplitudes around the frequency 2.56 mHz and its harmonics were detected in the cases of observations, performed at the disk center. Unfortunately, these frequencies are just in the range of the typical oscillations determined till now in the upper solar atmosphere ! Consequences of this instrumental effect for SUMER measurements of the chromospheric and transition region dynamics are discussed. Procedures how to exclude the effect from the data post-facto as well as how to modify the future SUMER oscillations measurements in order to avoid the effect are proposed

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