Poster abstract details

Many phenomena seen in solar atmosphere are connected with underphotospheric processes. These phenomena are, for example, longitude MHD oscillation observed in loop structures. Observations of the EUV (171A and 304A) emission oscillations in loop structures inside coronal hole with 20-40 min periods are presented in the report. These oscillations are shown to appear in several places of coronal hole directly after dynamical changes in coronal bright points on the border of the hole. But the background coronal hole emission oscillations and magnetic field changes are not detected. This fact allows us to assume that disturbances caused these oscillations propagate in underphotospheric layers. The comparison of the time of the oscillations beginning and bright point activity time allows us to estimate the disturbance propagating speed.