scholarly journals The Contribution of Faculae and Network to Long‐Term Changes in the Total Solar Irradiance

2003 ◽  
Vol 590 (2) ◽  
pp. 1088-1094 ◽  
Author(s):  
Stephen R. Walton ◽  
Dora G. Preminger ◽  
Gary A. Chapman
Keyword(s):  
Solar Irradiance ◽  
Total Solar Irradiance ◽  
Long Term Changes

Long-term Changes in Total Solar Irradiance and Their Predictions

2018 ◽  
Vol 58 (8) ◽  
pp. 1175-1186
Author(s):  
A. V. Mordvinov ◽  
A. A. Skakun ◽  
D. M. Volobuev
Keyword(s):  
Solar Irradiance ◽  
Total Solar Irradiance ◽  
Long Term Changes

scholarly journals VIRGO Radiometry and Total Solar Irradiance 1996–2000 Revised

2001 ◽  
Vol 203 ◽  
pp. 105-110 ◽  
Author(s):  
C. Fröhlich ◽  
W. Finsterle
Keyword(s):  
Solar Activity ◽  
Solar Irradiance ◽  
Solar Maximum ◽  
Total Solar Irradiance ◽  
Minimum Period ◽  
Long Term Changes ◽  
Early Increase ◽  
Solar Uv ◽  
Dependent Behaviour

The long-term changes of the VIRGO radiometers have been re-analyzed in detail in order to resolve the puzzle of the early increase of the total solar irradiance (TSI) as observed by VIRGO. The exposure dependent changes can be described by a model which is based on a combination of an early increase of the sensitivity and a degradation with time which is modulated by the dose of solar UV radiation each detector receives. After correcting for the exposure-dependent behaviour both operational radiometers show an increase of their sensitivity which depends only on the time they are switched-on. After removing this increase the VIRGO TSI remains more or less constant during the minimum period of solar activity and reaches the solar maximum at levels comparable to the ones of former maxima.

Long-term variations in total solar irradiance

Solar Physics ◽  
1994 ◽  
Vol 152 (1) ◽  
pp. 13-21 ◽  
Author(s):  
Judit M. Pap ◽  
Richard C. Willson ◽  
Claus Fr�hlich ◽  
Richard F. Donnelly ◽  
Larry Puga
Keyword(s):  
Solar Irradiance ◽  
Total Solar Irradiance ◽  
Long Term Variations

scholarly journals Ca II K spectroheliograms for studies of long-term changes in solar irradiance

2018 ◽  
Vol 13 (S340) ◽  
pp. 125-128 ◽  
Author(s):  
Theodosios Chatzistergos ◽  
Ilaria Ermolli ◽  
Natalie A. Krivova ◽  
Sami K. Solanki
Keyword(s):  
Solar Activity ◽  
Solar Irradiance ◽  
Long Term Changes

AbstractWe address the importance of historical full-disc Ca II K spectroheliograms for solar activity and irradiance reconstruction studies. We review our work on processing such data to enable them to be used in irradiance reconstructions. We also present our preliminary estimates of the plage areas from five of the longest available historical Ca II K archives.

Changing of the Guard for the Total Solar Irradiance Record

2020 ◽  
Author(s):  
Greg Kopp ◽  
David Harber ◽  
Karl Heuerman ◽  
Brandon Stone
Keyword(s):  
Solar Irradiance ◽  
Radiant Energy ◽  
Total Solar Irradiance ◽  
Data Availability ◽  
Solar Research ◽  
New Processing ◽  
The Many ◽  
Measurement Record ◽  
Future Plans

<p>The uninterrupted, 41-year-long, spaceborne total solar irradiance (TSI) record has recently undergone several changes in the instruments contributing to these measurements of the net incoming radiant energy providing nearly all the power driving the Earth’s climate system. Two long-term instruments, NASA’s SORCE/TIM and TCTE/TIM, have recently been powered off. This ends the 17-year record from the SORCE/TIM, which established the currently-accepted TSI value of 1361 W m<sup>‑2</sup> after its launch in 2003. ESA’s SoHO/VIRGO continues to acquire measurements that extend its 24-year record, but data availability has been on hold as a new processing methodology is implemented. NASA’s recently-launched TSIS‑1/TIM is presently continuing the measurements of these stalwart legacy instruments. This new TSI instrument is demonstrating higher on-orbit accuracy than any prior such instrument has achieved, with daily measurement updates that are available to the community for climate- and solar-research purposes. I will discuss the many recent changes to the spaceborne TSI measurement record, the current measurement-accuracy improvements and stabilities achieved and their implications for Earth energy-balance studies, and the future plans to maintain measurement continuity.</p>

Long-term total solar irradiance variability during sunspot cycle 22

1995 ◽  
Vol 100 (A2) ◽  
pp. 1667 ◽  
Author(s):  
Robert B. Lee ◽  
M. Alan Gibson ◽  
Robert S. Wilson ◽  
Susan Thomas
Keyword(s):  
Solar Irradiance ◽  
Sunspot Cycle ◽  
Total Solar Irradiance

scholarly journals Modeling Quiet Solar Luminosity Variability from TSI Satellite Measurements and Proxy Models during 1980–2018

2019 ◽  
Vol 11 (21) ◽  
pp. 2569 ◽  
Author(s):  
Nicola Scafetta ◽  
Richard Willson ◽  
Jae Lee ◽  
Dong Wu
Keyword(s):  
Solar Irradiance ◽  
Total Solar Irradiance ◽  
Main Question ◽  
Satellite Measurements ◽  
Significant Discrepancy ◽  
Solar Luminosity ◽  
Continuous Record ◽  
Before And After ◽  
Proxy Models

A continuous record of direct total solar irradiance (TSI) observations began with a series of satellite experiments in 1978. This record requires comparisons of overlapping satellite observations with adequate relative precisions to provide useful long term TSI trend information. Herein we briefly review the active cavity radiometer irradiance monitor physikalisch-meteorologisches observatorium davos (ACRIM-PMOD) TSI composite controversy regarding how the total solar irradiance (TSI) has evolved since 1978 and about whether TSI significantly increased or slightly decreased from 1980 to 2000. The main question is whether TSI increased or decreased during the so-called ACRIM-gap period from 1989 to 1992. There is significant discrepancy between TSI proxy models and observations before and after the gap, which requires a careful revisit of the data analysis and modeling performed during the ACRIM-gap period. In this study, we use three recently proposed TSI proxy models that do not present any TSI increase during the ACRIM-gap, and show that they agree with the TSI data only from 1996 to 2016. However, these same models significantly diverge from the observations from 1981 and 1996. Thus, the scaling errors must be different between the two periods, which suggests errors in these models. By adjusting the TSI proxy models to agree with the data patterns before and after the ACRIM-gap, we found that these models miss a slowly varying TSI component. The adjusted models suggest that the quiet solar luminosity increased from the 1986 to the 1996 TSI minimum by about 0.45 W/m2 reaching a peak near 2000 and decreased by about 0.15 W/m2 from the 1996 to the 2008 TSI cycle minimum. This pattern is found to be compatible with the ACRIM TSI composite and confirms the ACRIM TSI increasing trend from 1980 to 2000, followed by a long-term decreasing trend since.

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