Wisconsin H-Alpha Mapper

First interest in the ionised hydrogen of the interstellar medium came when Ron Reynolds pointed a spectrometer through a makeshift observing portal in an office of the University of Wisconsin-Madison's Physical Sciences Laboratory during the late 1970s. Reynolds and colleagues, including Matt Haffner, a senior scientist in UW-M's astronomy department, later developed WHAM.[1]

WHAM formally began life at Kitt Peak National Observatory (KPNO) in November 1996, using the flat mirrors of a two axis, all-sky siderostat passing light horizontally through a 0.6 m diameter, 8.6 m focal length objective lens into a 2.5 m x 2.5 m x 6 m trailer that contained the spectrometer, that used a low noise, high efficiency CCD camera as a multichannel detector behind a pair of 15 centimetres (5.9 in) diameter Fabry-Perot etalons/spectrometers.[2] The system was automated, so that the entire WHAM facility, including opening and closing at the beginning and end of the observing night, was operated from a campus office at the University of Wisconsin in Madison. It operated there from 1996 to 2008.

In 2009, WHAM was moved from KPNO to CTIO.[1]

WHAM's field of view allows a whole sky survey in about 2 years. WHAM mapped the details of the Reynolds Layer.

• List of astronomical observatories

• Official website
• WHAM publications
  • The Wisconsin H-Alpha Mapper Northern Sky Survey (2003 report)
  • Early Results from the Wisconsin H-Alpha Mapper Southern Sky Survey (2010 report)
• People
  • Matt Haffner - Senior Scientist
  • Ron Reynolds - Emeritus

{{University of Wisconsin–Madison}}