Acoustic and magnetic wave heating in stars - III. The chromospheric emission–magnetic filling factor relationD. Fawzy, K. Stępień, P. Ulmschneider, W. Rammacher and Z. E. MusielakA&A, 386 3 (2002) 994-1000DOI: https://doi.org/10.1051/0004-6361:20020253