Spatial Variation of Wave Periods of Magnetoacoustic-gravity Waves in the Flux-tube Chmielewski, P. ; Murawski, K. ; Sych, R. Abstract Publication: Acta Physica Polonica B Pub Date: 2016 DOI: 10.5506/APhysPolB.47.2273 Bibcode: 2016AcPPB..47.2273C