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HIFI GOT C+ Galactic plane [CII] spectral survey has detected strong emissionat the spiral arm tangencies. We use the unique viewing geometry of theScutum-Crux (S-C) tangency near i = 30degs to detect the warm ionized medium(WIM) component traced by [CII] and to study the effects of spiral densitywaves on Interstellar Medium (ISM) gas. We compare [CII] velocity features withancillary HI, 12CO and 13CO data near tangent velocities at each longitude toseparate the cold neutral medium and the warm neutral + ionized components inthe S-C tangency, then we identify [CII] emission at the highest velocitieswithout any contribution from 12CO clouds, as WIM. We present the GOT C+results for the S-C tangency. We interpret the diffuse and extended excess[CII] emission at and above the tangent velocities as arising in theelectron-dominated warm ionized gas in the WIM. We derive an electron densityin the range of 0.2 - 0.9 cm^-3 at each longitude, a factor of several higherthan the average value from Halpha and pulsar dispersion. We interpret theexcess [CII] in S-C tangency as shock compression of the WIM induced by thespiral density waves.

[CII] 158 micron line detection of the warm ionized medium in the Scutum--Crux spiral arm tangency