We report on a balloon-borne experiment to measure the anisotropy of the cosmic microwave background (CMB) radiation at angular scales of ≥4°. The instrument simultaneously measures in four spectral bands centered on 5.6 (1.8), 8.7 (1.1), 15.8 (0.63), and 22.5 (0.44) cm-1 (mm). We present three results: (1) the 95% confidence limit for monochromatic anisotropies is ΔT/T ≤ 1 × 10-4 on angular scales of 10°; (2) the Galactic plane dust emission at / = 42° is consistent with a v2 emissivity law at frequencies above 15 cm-1; below 15 cm-1, we detect excess emission; and (3) atmospheric ozone at an altitude of 35 km may form clumps as large as Δ emissivity/emissivity = 0.002.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
- Cosmic background radiation
- Interstellar: grains