2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/2026The Accretion-Ejection Instability (AEI), which can occur in magnetized disks near equipartition, is a good candidate to explain the low-frequency QPO in black-hole binaries. Here we present analytical work concerning the behavior of QPO frequency and the emission of Alfvén waves from the disk to the corona.2 pages, 2 color figures, to be published in `Proceedings of the Third Microquasar Workshop: Granada Workshop on galactic relativistic jet sources', Eds A. J.Castro-Tirado, J. Greiner and J. M. Paredes, Astrophysics and Space Science special issue, in pressAstrophysicstext