High Resolution Observations of Solar Spectral Variability Near Mg II Measured by HRTS

Details High Resolution Observations of Solar Spectral Variability Near Mg II Measured by HRTS High Resolution Observations of Solar Spectral Variability Near Mg II Measured by HRTS

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp32b03m&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP32B-03

Physics

0342 Middle Atmosphere--Energy Deposition, 7529 Photosphere, 7537 Solar And Stellar Variability, 7538 Solar Irradiance, 7549 Ultraviolet Emissions

Scientific paper

The HRTS-9 rocket flight occurred on April 18, 1995 and made measurements of solar spectral variability near the Mg II h and k lines. These observations include high spatial and spectral resolution spectrograms as well as spectroheliograms in four FUV passbands and H-alpha. The spectrograms cover the wavelength range 2665 to 2885Å with a spectral resolution of .2Å and a spatial resolution of 1 arc-second along a 900 arc-second slit. The most prominent features in this spectral range include the strong Mg II h and k lines near 2800 Å, the Mg I and Si I Fraunhofer lines near 2850 and 2880Å, respectively, and the line-blanketed quasi-continuum region. During the HRTS-9 flight, spectrograms and spectroheliograms where obtained of the quiet sun, quiet limb, plage, and sunspots. In addition to instrumental corrections, we have recently applied an absolute intensity calibration to the HRTS-9 data derived from SUSIM/ATLAS-3 and SUSIM/UARS observations. The analysis of these calibrated data has focused on the spectral variability of the above surface features and how these observations impact solar irradiance variability. Specifically, we examine the contrast variation of the plage and sunspot compared to the quiet sun as well as contrast variation within the quiet sun. In this presentation we will discuss the details of the observed spectra and wavelength dependent contrast factors. This will include a comparison of our present results with earlier estimates of plage contrast in this wavelength region and a discussion of the fine structures observed at high spectral resolution.

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