Its name comes from "COSMOlogical Structures On Medium Angular Scales" referring to CMB fluctuations.

In the COSMO15 instrument, the signal is split by a set of three filters, allowing simultaneous observations at 13, 15 and 17 GHz.

Thus, four 1-degree resolution sky maps complete in right ascension and covering 20 degrees in declination are obtained every day at these frequencies.

The most important result to come from this experiment is the cleanest detection of "spinning dust" in the Perseus molecular cloud.

If they have an asymmetrical electrical charge they can radiate like a lot of tiny dipole antennas.