Doc Ewen: The Horn, HI, and Other Events in US Radio Astronomy

Millimeter Wave Radiometry in the 1990s: MAPS slide 9

The last set of MAPS images obtained in South Deerfield, early spring 2003. Left to right: 35 GHz, 60 GHz, 95 GHz. This image set is a treasure of passive millimeter wave phenomenology. Note particularly:

• The difference in spatial resolution at 35 and 95 GHz
• The cold sky noise at 35 and 95 GHz compared with the warm sky at 60 GHz
• The "shadow" of the tree at 60 GHz caused by the cold ground in the shadow
• The underground cable seen at 60 GHz, crossing the shadow of the tree
• The spatial detail of the tree seen at 95 GHz
• The cold shadow of the storage trailer seen at both 60 and 95 GHz

Credit: Photos courtesy of Doc Ewen.
MAPS slide 10

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