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Temporally Extending Existing Web Archive Collections for Longitudinal Analysis
Lesley Frew, Michael L. Nelson, Michele C. Weigle
https://arxiv.org/abs/2505.24091

Temporally Extending Existing Web Archive Collections for Longitudinal Analysis
The Environmental Governance and Data Initiative (EDGI) regularly crawled US federal environmental websites between 2016 and 2020 to capture changes between two presidential administrations. However, because it does not include the previous administration ending in 2008, the collection is unsuitable for answering our research question, Were the website terms deleted by the Trump administration (2017--2021) added by the Obama administration (2009--2017)? Thus, like many researchers using the Way…

Magnetic evolution of complex solar active regions
Shabnam Nikbakhsh, Eija I. Tanskanen, Thomas Hackman
https://arxiv.org/abs/2505.21759 https://

Magnetic evolution of complex solar active regions
Aims. This study investigates the magnetic evolution of solar active regions (ARs), with a particular focus on understanding how the magnetic morphology of simple and complex ARs changes throughout their lifetime. Methods. To analyse the magnetic evolution of ARs, we developed a Magnetic Evolution Method (MEM) that segments each region's lifetime into three phases: growth, main, and recovery. The method was applied to ARs observed between January 1996 and December 2020. Results. We found that c…