Low-degree solar p-mode frequencies are at least three times less sensitive to ephemeral (weak-field) magnetic flux than to active-region flux, making activity-induced shifts at cycle minima negligible.
@doi [ ] 10.1007/s11207-017-1068-5, https://ui.adsabs.harvard.edu/abs/2017SoPh..292...67B 292
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Sensitivity of low-degree solar p modes to active and ephemeral regions: frequency shifts back to the Maunder Minimum
Low-degree solar p-mode frequencies are at least three times less sensitive to ephemeral (weak-field) magnetic flux than to active-region flux, making activity-induced shifts at cycle minima negligible.