Maipu and MU Radar 45 MHz Map
HEALPix, nested, res 6 (Nside=64)
2.4 to 4.6 degrees
Original Data Source
Guzmán et al. (2011) produced an all-sky map of 45 MHz emission by combining data from the 45 MHz survey of Alvarez et al. (1997) between declinations -90° and +19.1° with data from the 46.5 MHz survey of Maeda et al. (1999) between declinations +5° and +65°. The southern survey was made with the Maipu Radio Astronomy Observatory 45-MHz array with a beam of 4.6° (right ascension) x 2.4° (declination) FWHM. The northern survey was made with the Japanese Middle and Upper atmosphere (MU) radar array with a beam of 3.6° x 3.6°.
The Centre d'Analyse de Données Etendues group used the Guzmán et al. brightness temperature data on a Galactic coordinate grid from the Max Planck Institute for Radioastronomy Survey Sampler site to form an all-sky HEALPix format map following the method described in Appendix A of Paradis et al. 2012, A&A, 543, 103, ADS. Their HEALPix map is mirrored here.
Guzmán et al. 2011, A&A, 525, A138, ADS
Maeda et al. 1999, A&AS, 140, 145, ADS
Alvarez et al. 1997, A&AS, 124, 315, ADS