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Understanding the composition of the Warm Ionized Medium (WIM) is important
to understanding the make-up of the galaxy and universe. Observations
of distant objects are necessarily taken through the WIM, thus is it essential
to understand its composition and structure in order to fully understand
any observations made. The Wisconsin H-Alpha Mapper (WHAM) has recently
completed it’s Northern Sky Survey of H-alpha emission. The results
of the WHAM survey show evidence of variations in the electron temperature
within the WIM and suggests an additional heating source of the WIM beyond
the photoionization heating already known. In order to confirm the existence
of the additional heating new observations must be made. Emission lines
of the [OII] 3727Å doublet are excellent diagnostics for this.
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