He + ions in the vicinity of mercury observed by the MESSENGER and BepiColombo spacecraft - Markus Fränz; Harald Krüger; Jim M. Raines; Austin N. Glass; Daniel J. Gershman; Fabio Prencipe; Norbert Krupp; Lina Z. Hadid; Dominique Delcourt; Sae Aizawa; Shoichiro Yokota; Yuki Harada; et al. (Planetary and Space Science, 2025)