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Advances in Astronomy
Volume 2012, Article ID 623709, 5 pages
http://dx.doi.org/10.1155/2012/623709
Research Article

Preliminary Results on Irradiance Measurements from Lyra and Swap

1Department of Physics, Auden Technology and Management Academy (ATMA), Bangalore 562112, India
2Indian Institute of Astrophysics, Bangalore 560 034, India
3Royal Observatory of Belgium (ROB), Circular Avenue 3, B-1180 Brussels, Belgium
4LATMOS, 11 Boulevard d'Alembert, 78280 Guyancourt, France
5Department of Physics, Bangalore University, Bangalore 560056, India

Received 14 November 2011; Accepted 9 December 2011

Academic Editor: J. Javaraiah

Copyright © 2012 S. T. Kumara et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Linked References

  1. G. J. Rottman, “Observations of solar UV and EUV variability,” Advances in Space Research, vol. 8, no. 7, pp. 53–66, 1988. View at Google Scholar · View at Scopus
  2. G. Brasseur, “The response of the middle atmosphere to long-term and short-term solar variability: a two-dimensional model,” Journal of Geophysical Research, vol. 982, pp. 23079–23090, 1993. View at Google Scholar
  3. L. L. Hood, J. L. Jirikowic, and J. P. McCormack, “Quasi-decadal variability of the stratosphere: in uence of long-term solar ultraviolet variations,” Journal of Atmospheric Sciences, vol. 50, pp. 3941–3958, 1993. View at Google Scholar
  4. T. Egorova, E. Rozanov, E. Manzini et al., “Chemical and dynamical response to the 11-year variability of the solar irradiance simulated with a chemistry-climate model,” Geophysical Research Letters, vol. 31, no. 6, Article ID L06119, 2004. View at Google Scholar · View at Scopus
  5. E. Rozanov, M. Schraner, M. Wild et al., “Assessment of the Ozone and Temperature Trends for 1975–2000 with a transient Chemistry-Climate Model,” in Proceedings of the 35th COSPAR Scientific Assembly, J.-P. Paillé, Ed., vol. 35, p. 2640, 2004.
  6. H. Hudson and R. Willson, “The nature of the solar-cycle variation of total irradiance,” in Solar Radiative Output Variations, P. Foukal, Ed., p. 318, 1988. View at Google Scholar
  7. C. Frohlich, “Irradiance observations of the sun,” in Poster Proceedings from IAU Colloquium 143: The Sun as a Variable Star: Solar and Stellar Irradiance Variations, J. M. Pap, C. Frohlich, H. S. Hudson, and S. K. Solanki, Eds., p. 28, 1994. View at Google Scholar
  8. P. Foukal and J. Lean, “Magnetic modulation of solar luminosity by photospheric activity,” Astrophysical Journal, vol. 328, pp. 347–357, 1988. View at Google Scholar
  9. R. Kariyappa and J. M. Pap, “Contribution of chromospheric features to uv irradiance variability from spatially-resolved ca ii k spectroheliograms i. A New Method of Analysis and Preliminary Results,” Solar Physics, vol. 167, no. 1-2, pp. 115–123, 1996. View at Google Scholar · View at Scopus
  10. J. R. Worden, O. R. White, and T. N. Woods, “Evolution of chromospheric structures derived from Ca II K spectroheliograms: implications for solar ultraviolet irradiance variability,” Astrophysical Journal, vol. 496, no. 2, pp. 998–1014, 1998. View at Google Scholar · View at Scopus
  11. J. Lean, “Solar ultraviolet irradiance variations—a review,” Journal of Geophysical Research, vol. 92, pp. 839–868, 1987. View at Google Scholar
  12. H. P. Warren, J. T. Mariska, and J. Lean, “A new model of solar EUV irradiance variability 1. Model formulation,” Journal of Geophysical Research A, vol. 106, no. 8, pp. 15745–15757, 2001. View at Google Scholar · View at Scopus
  13. T. Woods, F. Eparvier, and D. Woodraska, “Solar ultraviolet variability during the TIMED mission,” in Proceedings of the AGU Fall Meeting Abstracts, p. B2, San Francisco, Calif, USA, December 2003.
  14. J. L. Lean, H. P. Warren, J. T. Mariska, and J. Bishop, “A new model of solar EUV irradiance variability 2. Comparisons with empirical models and observations and implications for space weather,” Journal of Geophysical Research A, vol. 108, no. 2, article no. 1059, 2003. View at Publisher · View at Google Scholar · View at Scopus
  15. J. F. Hochedez, W. Schmutz, Y. Stockman et al., “LYRA, a solar UV radiometer on Proba2,” Advances in Space Research, vol. 37, no. 2, pp. 303–312, 2006. View at Publisher · View at Google Scholar · View at Scopus
  16. A. Benmoussa, I. E. Dammasch, J.-F. Hochedez et al., “Preight calibration of LYRA, the solar VUV radiometer on board PROBA2,” Astronomy and Astrophysics, vol. 508, pp. 1085–1094, 2009. View at Google Scholar
  17. D. Berghmans, J. F. Hochedez, J. M. Defise et al., “SWAP onboard PROBA 2, a new EUV imager for solar monitoring,” Advances in Space Research, vol. 38, pp. 1807–1811, 2006. View at Google Scholar
  18. J.-P. Halain, D. Berghmans, J.-M. Defise et al., “First light of SWAP on-board PROBA2,” in Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, vol. 7732 of Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, July 2010.
  19. O. C. Wilson, “Flux measurements at the centers of stellar h- and kLines,” Astrophysical Journal, vol. 153, p. 221, 1968. View at Google Scholar
  20. R. Kariyappa and K. R. Sivaraman, “Variability of the solar chromospheric network over the solar cycle,” Solar Physics, vol. 152, no. 1, pp. 139–144, 1994. View at Publisher · View at Google Scholar · View at Scopus
  21. R. Kariyappa, J. M. Pap, K. S. Balasubramaniam, and J. R. Kuhn, “Preliminary results of the analysis of CAII K spectroheliograms,” in Helioseismology, vol. 376 of ESA Special Publication, p. 429, 1995. View at Google Scholar
  22. R. Kariyappa, “Quiet-sun variability with the solar cycle,” in High Resolution Solar Physics: Theory, Observations, and Techniques, T. R. Rimmele, K. S. Balasubramaniam, and R. R. Radick, Eds., vol. 183 of Astronomical Society of the Pacific Conference Series, p. 501, 1999. View at Google Scholar
  23. R. Kariyappa, “Call K imaging to understand UV irradiance variability,” Journal of Astrophysics and Astronomy, vol. 21, no. 3-4, pp. 293–297, 2000. View at Google Scholar · View at Scopus
  24. R. Kariyappa and K. R. Sivaraman, “Variability of caII K emission flux over the solar cycle,” Bulletin of the Astronomical Society of India, vol. 33, pp. 365–365, 2005. View at Google Scholar
  25. R. Kariyappa and L. Dame, “Contribution of chromospheric features to UV irradiance variability,” in Proceedings of the IAU Joint Discussion, vol. 8, August 2006.
  26. M. K. V. Bappu and K. R. Sivaraman, “K emission-line widths and the solar chromosphere,” Solar Physics, vol. 17, no. 2, pp. 316–330, 1971. View at Publisher · View at Google Scholar · View at Scopus