110. Onset of Photospheric Impacts and Helioseismic Waves in X9.3 Solar Flare of September 6, 2017
109. How Many Active Regions Are Necessary to Predict the Solar Dipole Moment?
To assess the impact of active regions to the axial dipole moment, the authors isolate the contribution of individual regions for Cycles 21, 22, and 23 using a surface flux transport model, and find that although the top ~10% of contributors tend to define sudden large variations in the dipole moment, the cumulative contribution of many weaker regions cannot be ignored.
108. Signatures of Solar Cycle 25 in Subsurface Zonal Flows
107. Cyclic Variations of the Sun’s Seismic Radius
106. The vector magnetic field of the Sun-as-a-star during activity cycle 24
105. Waves of Magnetic-field Variations Observed in a Flare-excited Sunquake Event
Waves of magnetic-field variations were observed associated with the sunquake waves that were excited by the X9.3 flare on 2017 September 6. The nature and cause of the magnetic waves are discussed after the phase relations and power distributions of the magnetic waves and Doppler-observed sunquake waves are investigated.