NDLI: The Impact of the Revised Sunspot Record on Solar Irradiance Reconstructions

Content Provider	Springer Nature Link
Author	Kopp, G. Krivova, N. Wu, C. J. Lean, J.
Copyright Year	2016
Abstract	Reliable historical records of the total solar irradiance (TSI) are needed to assess the extent to which long-term variations in the Sun’s radiant energy that is incident upon Earth may exacerbate (or mitigate) the more dominant warming in recent centuries that is due to increasing concentrations of greenhouse gases. We investigate the effects that the new Sunspot Index and Long-term Solar Observations (SILSO) sunspot-number time series may have on model reconstructions of the TSI. In contemporary TSI records, variations on timescales longer than about a day are dominated by the opposing effects of sunspot darkening and facular brightening. These two surface magnetic features, retrieved either from direct observations or from solar-activity proxies, are combined in TSI models to reproduce the current TSI observational record. Indices that manifest solar-surface magnetic activity, in particular the sunspot-number record, then enable reconstructing historical TSI. Revisions of the sunspot-number record therefore affect the magnitude and temporal structure of TSI variability on centennial timescales according to the model reconstruction methods that are employed. We estimate the effects of the new SILSO record on two widely used TSI reconstructions, namely the NRLTSI2 and the SATIRE models. We find that the SILSO record has little effect on either model after 1885, but leads to solar-cycle fluctuations with greater amplitude in the TSI reconstructions prior. This suggests that many eighteenth- and nineteenth-century cycles could be similar in amplitude to those of the current Modern Maximum. TSI records based on the revised sunspot data do not suggest a significant change in Maunder Minimum TSI values, and from comparing this era to the present, we find only very small potential differences in the estimated solar contributions to the climate with this new sunspot record.
Starting Page	2951
Ending Page	2965
Page Count	15
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	291
Issue Number	9-10
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-03-23
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Total solar irradiance TSI Solar variability Climate change Astrophysics and Astroparticles Atmospheric Sciences Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics)
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

The Revised Sunspot Record in Comparison to Cosmogenic Radionuclide-Based Solar Activity Reconstructions

A Revised Collection of Sunspot Group Numbers

The Revised Brussels–Locarno Sunspot Number (1981 – 2015)

The New Sunspot-Number Index and Solar-Cycle Characteristics

Changing Relationships Between Sunspot Number, Total Sunspot Area and $F_{10.7}$ in Cycles 23 and 24

Tests of Sunspot Number Sequences: 4. Discontinuities Around 1946 in Various Sunspot Number and Sunspot-Group-Number Reconstructions

Correlation Between Sunspot Number and Ca ii K Emission Index

Sunspot Numbers from ISOON: A Ten-Year Data Analysis

Investigation of Sunspot Area Varying with Sunspot Number

The Impact of the Revised Sunspot Record on Solar Irradiance Reconstructions

Similar Documents

The Revised Sunspot Record in Comparison to Cosmogenic Radionuclide-Based Solar Activity Reconstructions

A Revised Collection of Sunspot Group Numbers

The Revised Brussels–Locarno Sunspot Number (1981 – 2015)

The New Sunspot-Number Index and Solar-Cycle Characteristics

Changing Relationships Between Sunspot Number, Total Sunspot Area and $F_{10.7}$ in Cycles 23 and 24

Tests of Sunspot Number Sequences: 4. Discontinuities Around 1946 in Various Sunspot Number and Sunspot-Group-Number Reconstructions

Correlation Between Sunspot Number and Ca ii K Emission Index

Sunspot Numbers from ISOON: A Ten-Year Data Analysis

Investigation of Sunspot Area Varying with Sunspot Number

The Impact of the Revised Sunspot Record on Solar Irradiance Reconstructions