Tootfinder

This is the third full build iteration of my miniature #QRP unun supporting both EFHW and "random wire" antennas. At this point, it is still fiddly to build, but I'd expect an experienced #HamRadio DIY / homebrew enthusiast to find the build not terribly difficult.
There's nothing…

Differential rotation of solar {\alpha}-sunspots and implications for stellar light curves
Emily Joe L\"o{\ss}nitz, Alexander G. M. Pietrow, Hritam Chakraborty, Meetu Verma, Ioannis Kontogiannis, Horst Balthasar, Carsten Denker, Monika Lendl
https://arxiv.org/abs/2508.08196

Differential rotation of solar α-sunspots and implications for stellar light curves
Differential rotation is a key driver of magnetic activity and dynamo processes in the Sun and other stars, especially as the rate differs across the solar layers, but also in active regions. We aim to accurately quantify the velocity at which round α-spots traverse the solar disk as a function of their latitude, and compare these rates to those of the quiet-Sun and other sunspot types. We then extend this work to other stars and investigate how differential rotation affects the modulation of …

An efficient and robust high-order compact ALE gas-kinetic scheme for unstructured meshes
Yibo Wang, Xing Ji, Liang Pan
https://arxiv.org/abs/2508.11283 https://

An efficient and robust high-order compact ALE gas-kinetic scheme for unstructured meshes
For the arbitrary-Lagrangian-Eulerian (ALE) calculations, the geometric information needs to be calculated at each time step due to the movement of mesh. To achieve the high-order spatial accuracy, a large number of matrix inversions are needed, which affect the efficiency of computation dramatically. In this paper, an efficient and robust high-order compact ALE gas-kinetic scheme is developed for the compressible moving grids and moving boundary problems. The memory-reduction reconstruction is…