The solar hydrogen Lyman α to Lyman β line ratio

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Table 2

Lyα/Lyβ irradiance energy ratio during a solar activity cycle.

Reference	Ratio (σ or %)	Mission/Instrument

	minimum activity
Lemaire et al. (1978)	69 (±30%)	OSO8/LPSP
this work	71 (6)	TIMED/EGS-SEE

	moderate activity
Donnelly & Pope (1973)	75 (50%)	compilation

	maximum activity
this work	55 ( 4)	TIMED/EGS-SEE

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