A History of Solar Activity over Millennia

Abstract

Presented here is a review of present knowledge of the long-term behavior of solar activity on a multi-millennial timescale, as reconstructed using the indirect proxy method. The concept of solar activity is discussed along with an overview of the special indices used to quantify different aspects of variable solar activity, with special emphasis upon sunspot number. Over long timescales, quantitative information about past solar activity can only be obtained using a method based upon indirect proxies, such as the cosmogenic isotopes \super{14}C and \super{10}Be in natural stratified archives (e.g., tree rings or ice cores). We give an historical overview of the development of the proxy-based method for past solar-activity reconstruction over millennia, as well as a description of the modern state. Special attention is paid to the verification and cross-calibration of reconstructions. It is argued that this method of cosmogenic isotopes makes a solid basis for studies of solar variability in the past on a long timescale (centuries to millennia) during the Holocene. A separate section is devoted to reconstructions of strong solar energetic-particle (SEP) events in the past, that suggest that the present-day average SEP flux is broadly consistent with estimates on longer timescales, and that the occurrence of extra-strong events is unlikely. Finally, the main features of the long-term evolution of solar magnetic activity, including the statistics of grand minima and maxima occurrence, are summarized and their possible implications, especially for solar/stellar dynamo theory, are discussed.

A review, 91 pages, 28 figures. available online at http://solarphysics.livingreviews.org/Articles/lrsp-2013-1/

References in corpus (20)

• Grand minima and maxima of solar activity: New observational constraints
• Evolution of the solar irradiance during the Holocene
• Predicting solar cycle 24 with a solar dynamo model
• A new approach to long-term reconstruction of the solar irradiance leads to large historical solar forcing
• The AD775 cosmic event revisited: the Sun is to blame
• Solar activity forecast with a dynamo model
• Historical Sunspot Observations: A Review
• A new model of cosmogenic production of radiocarbon 14C in the atmosphere
• Occurrence of extreme solar particle events: Assessment from historical proxy data
• On Predicting the Solar Cycle using Mean-Field Models
• A solar cycle lost in 1793--1800: Early sunspot observations resolve the old mystery
• The butterfly diagram in the 18th century
• Revisited sunspot data: A new scenario for the onset of the Maunder minimum
• Solar Grand Minima and random fluctuations in dynamo parameters
• Turbulent Pumping of Magnetic Flux Reduces Solar Cycle Memory and thus Impacts Predictability of the Sun's Activity
• Variations of the solar cycle profile in a solar dynamo with fluctuating dynamo governing parameters
• Modeling atmospheric effects of the September 1859 Solar Flare
• A Simple Method to Check the Reliability of Annual Sunspot Number in the Historical Period 1610-1847
• Modeling a Maunder Minimum
• The chaotic solar cycle II. Analysis of cosmogenic 10Be data

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