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Sunspots host various oscillations and wave phenomena like umbral flashes,umbral oscillations, running penumbral waves, and coronal waves. All fan loopsrooted in sunspot umbra constantly show a 3-min period propagating slowmagnetoacoustic waves in the corona. However, their origin in the loweratmosphere is still unclear. In this work, we studied these oscillations indetail along a clean fan loop system rooted in active region AR12553 for aduration of 4-hour on June 16, 2016 observed by Interface Region ImagingSpectrograph (IRIS) and Solar Dynamics Observatory (SDO). We traced foot-pointsof several fan loops by identifying their locations at different atmosphericheights from the corona to the photosphere. We found presence of 3-minoscillations at foot-points of all the loops and at all atmospheric heights. Wefurther traced origin of these waves by utilising their amplitude modulationcharacteristics while propagating in the solar atmosphere. We found severalamplitude modulation periods in the range of 9-14 min, 20-24 min, and 30-40 minof these 3-min waves at all heights. Based on our findings, we interpret that3-min slow magnetoacoustic waves propagating in coronal fan loops are driven by3-min oscillations observed at the photospheric foot-points of these fan loopsin the umbral region. We also explored any connection between 3-min and 5-minoscillations observed at the photospheric foot-points of these loops and foundthem to be weakly coupled. Results provide clear evidence of magnetic couplingof the solar atmosphere through propagation of 3-min waves along fan loops atdifferent atmospheric heights.

Exploring source region of 3-min slow magnetoacoustic waves observed in coronal fan loops rooted in sunspot umbra