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AGU: Geophysical Research Letters

 

Keywords

  • solar irradiance

Index Terms

  • Solar Physics, Astrophysics, and Astronomy: Solar irradiance
  • Solar Physics, Astrophysics, and Astronomy: Magnetic fields
  • Solar Physics, Astrophysics, and Astronomy: Solar activity cycle
  • Solar Physics, Astrophysics, and Astronomy: Photosphere
  • Solar Physics, Astrophysics, and Astronomy: Solar and stellar variability

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 36, L20101, 4 PP., 2009
doi:10.1029/2009GL040707

ACRIM-gap and total solar irradiance revisited: Is there a secular trend between 1986 and 1996?

N. A. Krivova

Max Planck Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany

S. K. Solanki

Max Planck Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany

School of Space Research, Kyung Hee University, Yongin, South Korea

T. Wenzler

Max Planck Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany

Hochschule für Technik Zürich, Zurich, Switzerland

A gap in the total solar irradiance (TSI) measurements between ACRIM-1 and ACRIM-2 led to the ongoing debate on the presence or not of a secular trend between the minima preceding cycles 22 (in 1986) and 23 (1996). It was recently proposed to use the SATIRE model of solar irradiance variations to bridge this gap. When doing this, it is important to use the appropriate SATIRE-based reconstruction, which we do here, employing a reconstruction based on magnetograms. The accuracy of this model on months to years timescales is significantly higher than that of a model developed for long-term reconstructions used by the ACRIM team for such an analysis. The constructed ‘mixed’ ACRIM — SATIRE composite shows no increase in the TSI from 1986 to 1996, in contrast to the ACRIM TSI composite.

Received 27 August 2009; accepted 17 September 2009; published 16 October 2009.

Citation: Krivova, N. A., S. K. Solanki, and T. Wenzler (2009), ACRIM-gap and total solar irradiance revisited: Is there a secular trend between 1986 and 1996?, Geophys. Res. Lett., 36, L20101, doi:10.1029/2009GL040707.

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