Full-sky Lyman-α emission maps in ecliptic (J2000) coordinates recorded by SOHO/SWAN in September 1997 (top panel) and September 2000 (bottom panel). The maps are presented in ecliptic coordinates centered at ~180°, with ecliptic longitude increasing from right to left. The color scales are in Rayleighs. The two masked areas correspond to the shadow of the spacecraft (centered at ~0°) and to the shadows of the Sun shields that protect the sensors from direct sunlight (centered at ~180°).