  The Wisconsin H-Alpha Mapper (WHAM) Northern Sky Survey is revealing that
many intermediate-velocity (|v_LSR| <= 100 km/s) neutral clouds and complexes
have an associated ionized component. We present the first map of the H-Alpha
emission from an intermediate- or high-velocity structure: Complex K. This
large, high-latitude feature stretches from l = 10 to 70 degrees, b = +30 to
+70 degrees and peaks in velocity over v_LSR ~ -60 to -80 km/s. The neutral and
ionized gas generally trace each other quite well in the complex, but the
detailed structure is not identical. In particular, the H-Alpha emission peaks
in brightness at slightly higher Galactic longitudes than corresponding 21 cm
features. The ionized gas has a peak H-Alpha intensity of 0.5 Rayleighs,
corresponding to an emission measure of 1.1 cm^-6 pc. Structures in the complex
are traced by WHAM down to about 0.1 Rayleighs (0.2 cm^-6 pc). Typical line
widths of the H-Alpha emission are ~ 30 km/s, limiting temperatures in the
ionized gas to < 20,000 K. If radiation is the primary ionizing mechanism, the
Lyman continuum flux required to sustain the most strongly emitting ionized
regions is 1.2 x 10^6 photons cm^-2 s^-1. There appears to be no local, stellar
source capable of maintaining the ionization of the gas; however, the required
ionizing flux is consistent with current models of the escape of Lyman
continuum radiation from OB stars in the disk and of ionizing radiation
produced by cooling supernova remnants.
