Solar Physics

, Volume 184, Issue 1, pp 87–102 | Cite as

Synoptic Hα Full-Disk Observations of the Sun from Big Bear Solar Observatory – I. Instrumentation, Image Processing, Data Products, and First Results

  • C. Denker
  • A. Johannesson
  • W. Marquette
  • P.R. Goode
  • H. Wang
  • H. Zirin
Article

Abstract

The Big Bear Solar Observatory (BBSO) has a long tradition of synoptic full-disk observations. Synoptic observations of contrast enhanced full-disk images in the Ca ii K-line have been used with great success to reproduce the H i Lα irradiance variability observed with the Upper Atmosphere Research Satellite (UARS). Recent improvements in data calibration procedures and image- processing techniques enable us now to provide contrast enhanced Hα full-disk images with a spatial resolution of approximately 2′′ and a temporal resolution of up to 3 frames min−1.

In this first paper in a series, we describe the instruments, the data calibration procedures, and the image-processing techniques used to obtain our daily Hα full-disk observations. We also present the final data products such as low- and high-contrast images, and Carrington rotation charts. A time series of an erupting mini- filament further illustrates the quality of our Hα full-disk observations and motivate one of the future research projects. This lays a solid foundation for our subsequent studies of solar activity and chromospheric fine structures. The high quality and the sunrise- to-sunset operation of the Hα full-disk observations presented in this paper make them an ideal choice to study statistical properties of mini-filament eruptions, chromospheric differential rotation, and meridional flows within the chromosphere, as well as the evolution of active regions, filaments, flares, and prominences.

Keywords

Flare Solar Activity Temporal Resolution Differential Rotation Meridional Flow 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Akioka, M.: 1996, J. Geomag. Geoelectr. 48, 5.Google Scholar
  2. Beckers, J.: 1997, Bull. Am. Astron. Soc. 29/2, 897.Google Scholar
  3. Chapman, G. A.: 1970, Solar Phys. 13, 78.Google Scholar
  4. Denker, C. and Wang, H.: 1998, Astrophys. J. 502, 493.Google Scholar
  5. Domingo, V., Fleck, B., and Poland, A. I.: 1995, Solar Phys. 162, 1.CrossRefGoogle Scholar
  6. Fleck, B.: 1997, The First Results from SOHO, Solar Phys. 170/1.Google Scholar
  7. Harrison, R. A.: 1995, Astron. Astrophys. 304, 585.Google Scholar
  8. Hermans, L. M. and Martin, S. F.: 1986, in A. I. Poland (ed.), Coronal and Prominence Plasmas, NASA Conf. Publ. 2442, p. 369.Google Scholar
  9. Johannesson, A., Marquette, W., and Zirin, H.: 1998, Solar Phys. 177, 265.Google Scholar
  10. Johannesson, A., Marquette, W., and Zirin, H.: 1995, Solar Phys. 161, 201.Google Scholar
  11. Kuhn, J. R., Lin, H., and Loranz, D.: 1991, Publ. Astron. Soc. Pac. 103, 1097.Google Scholar
  12. LaBonte, B. J.: 1979, Solar Phys. 61, 283.Google Scholar
  13. Lean, J. L., Cook, J., Marquette, W., and Johannesson, A.: 1998, Astrophys. J. 492, 390.Google Scholar
  14. McAllister, A. H., Dryer, M., McIntosh, P., Singer, H., and Weiss, L.: 1996, J. Geophys. Res. 101, 13.Google Scholar
  15. Niot, J. M. and Noëns, J. C.: 1997, Solar Phys. 173, 53.Google Scholar
  16. NOST: 1991, Implementation of the Flexible Image Transport System (FITS). NASA/OSSA, Goddard Space Flight Center, Greenbelt.Google Scholar
  17. Strong, K., Bruner, M., Tarbell, T., Title, A., and Wolfson, C. J.: 1994, Space Sci. Rev. 70, 119.CrossRefGoogle Scholar
  18. Wang, H., Komenda, A., Tang, F., and Zirin, H.: 1998, Solar Phys. 178, 109.Google Scholar
  19. Warren, H. P., Mariska, J. T., Lean, J., Marquette, W., and Johannesson, A.: 1996, Geophys. Res. Lett. 23, 2207.Google Scholar

Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • C. Denker
    • 1
  • A. Johannesson
    • 1
  • W. Marquette
    • 1
  • P.R. Goode
    • 1
  • H. Wang
    • 1
  • H. Zirin
    • 2
  1. 1.Big Bear Solar Observatory, New Jersey Institute of TechnologyBig Bear CityU.S.A
  2. 2.California Institute of TechnologyPasadenaU.S.A

Personalised recommendations