Solar UV flux measurements from the SBUV2 monitor on the NOAA9 satellite. Part 1, Mg II h & k line core-to-wing ratios for 1986-1988

Details

• Personal Author:
  Donnelly, R. F. ; Puga, L. C. ; Barrett, J. ; Bouwer, S. D. ; Pap, J. ; Stevens, D. E. ; Tobiska, W. K.
• Corporate Authors:
  Space Environment Laboratory
• NOAA Program & Office:
  OAR (Oceanic and Atmospheric Research)
• Description:
  Analyses ofthe discrete-wavelength mode of observations ofthe solar full-disk Mg II h and k line spectral irradiance measured by the Solar Backscatter UV Monitor (SBUV2) on the NOAA9 satellite are presented. Relative photometry techniques were used to derive a core-to-wing ratio (RMgll)- Thisratio has beenmodified, relative to that used by Heath and Schlesinger’s (1986) classical Mg ITratio derived forsolar UVmeasurements made by their SBUV experiment aboard the Nimbus-7 satellite, to avoid inter-range instrumentation drifts encountered in the NOAA9 SBUV2 monitor. Prior research of the solar Mg II h and k lines is reviewed. The rawmeasurements and observational parameters, such as the angle of the Sun as seen at the SBUV2 monitor, are discussed. Temporal interpolations among the sets ofdiscrete-mode measurements are used to account formost ofthe Sun-angle dependence and to reduce the sensitivity ofthe resultsto any errors in the Sun angles. Wavelength “jitter” and long-term drift are studied, and intensity linearity and inter-range drift are analyzed. The NOAA9 results are compared with same-day Nimbus-7 data, the Kitt Peak Ca K1Aindex, the Canadian 10.7 cm solar radio flux, and observations ofthe solar H Lyman a line. Rocket- and balloon-flight observations ofthe Mg II h and k lines, made with fine-wavelength resolution, are analyzed to determine what their characteristics would be like if they were observed with the broad passband ofthe Nimbus 7 and NOAA9 instruments. RMgll results are presented for 1986-1988.
• Keywords:
  Solar Radiation Ultraviolet Radiation Ultraviolet Spectrometry Solar Radiation Ultraviolet Radiation Ultraviolet Spectrometry
• Series:
  NOAA technical memorandum ERL SEL   85
• Document Type:
  Technical Memorandum
• License:
  https://creativecommons.org/publicdomain/zero/1.0/
• Rights Information:
  CC0 Public Domain
• Compliance:
  Library
• Main Document Checksum:
  urn:sha256:a27e64f8d1c1b633d3dbc930c95d7ea48afb6784f731bad1f10d53a91abac3d2
• Download URL:
  https://repository.library.noaa.gov/view/noaa/32779/noaa_32779_DS1.pdf
• File Type:
  [PDF - 240.14 MB ]