|Channel||Hα (l1)||Ca II (l2)|
|Central filter wavelength λ (nm)||656.28||393.37|
|Equiv. filter bandwidth Δλ (nm)||0.050||0.25|
|Im(λ) above atm./W m−2 nm−1||0.36 ± 0.02||0.33 ± 0.07|
|Im integ. through filter/W m−2||0.018||0.083|
|K solar surf./kW m−2 nm−1 sr−1||529 ± 30||485 ± 90|
|Lm solar surf./kW m−2 sr−1||26.5 ± 1.5||122 ± 26|
Notes. First pair of lines: specifications of our filters. Middle: irradiance from the calibrated solar spectrum in blue from Fig. 6, integrated over the transmission curve. Bottom: calibration factors.
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