Space Physics2026-09-023 minarXiv:2609.03088Reconnection Layer Thickness: Four Probes versus OneFour witnesses to a single crossing. On November 10, 2017, the four MMS spacecraft flew through an invisible boundary in the solar wind where magnetic field lines reconfigure and release energy.Mani K Chettri·Rupak Mukherjee·Hemam D. Singhmagnetic reconnection👍👎☆SimplePopularAdvanced