Continuous J/H-band sky brightness measurements at Dome A yield daytime medians of 5.2/2.9 and nighttime 15.3/13.4 mag arcsec^{-2}, with twilight boundaries at solar elevations of -9.3° (J) and -7.4° (H) and a noted sunspot association in H during polar night.
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$J$ and $H$ band sky brightness measurements from polar day to polar night at Dome A, Antarctica
Continuous J/H-band sky brightness measurements at Dome A yield daytime medians of 5.2/2.9 and nighttime 15.3/13.4 mag arcsec^{-2}, with twilight boundaries at solar elevations of -9.3° (J) and -7.4° (H) and a noted sunspot association in H during polar night.