Solar magnetic fields and terrestrial climate

TL;DR

This paper reconstructs past solar irradiance and geomagnetic activity from geomagnetic data and forecasts future variations, highlighting their significance in understanding natural influences on climate change.

Contribution

It introduces a method to reconstruct solar irradiance from geomagnetic records and provides future projections relevant for climate modeling.

Findings

Reconstructed historical solar irradiance using geomagnetic data.

Projected future solar irradiance and geomagnetic activity.

Implications for natural climate variability understanding.

Abstract

Solar irradiance is considered one of the main natural factors affecting terrestrial climate, and its variations are included in most numerical models estimating the effects of natural versus anthropogenic factors for climate change. Solar wind causing geomagnetic disturbances is another solar activity agent whose role in climate change is not yet fully estimated but is a subject of intense research. For the purposes of climate modeling, it is essential to evaluate both the past and the future variations of solar irradiance and geomagnetic activity which are ultimately due to the variations of solar magnetic fields. Direct measurements of solar magnetic fields are available for a limited period, but can be reconstructed from geomagnetic activity records. Here we present a reconstruction of total solar irradiance based on geomagnetic data, and a forecast of the future irradiance and geomagnetic activity relevant for the expected climate change.