The fifth European Solar Physics Nugget has now been released.
Nugget #5 comes from Theodosios Chatzistergos (Max Planck Institute for Solar System Research, Germany) and collaborators, who show how historical photographic archives of the Sun can help extend solar irradiance measurements back into the past.
It can be found at:
https://est-east.eu/nuggets/46-espn/1155-espn-5
The aim of the European Solar Physics (ESP) Nuggets is to aid in the communication of recent science results from the European Solar Physics community. More information on the ESP Nuggets can be found at: