Wind Waves RAD1_L3A : Direction Finding Data (Unpolarized Source Assumption)

This data set contains Wind Waves RAD1 direction-finding data. Direction-finding inversion method has been applied on RAD1_L2 high resolution data to derive characteristics of radio emissions. The method is based on the work by Manning and Fainberg, Space Science Instrumentation, 1980. It returns the absolute flux density (in W/m^2/Hz) of the radio source, as well as the azimuth, and the elevation angles (in degrees) in a RTN reference frame centered on the Wind spacecraft. The method is only valid under the following criteria: * Radio source is unpolarized * Radio source has an uniform brightness * Radio source signal remains constant at a given frequency over a spacecraft rotation (~3sec) * Short antenna dipole assumption is valid * Z axial antenna is not tilted Absolute flux density is calibrated using radio galaxy method (see Zaslavsky et al., 2011. DOI 10.1029/2010RS004464). Caveat: Level 3 df data are computed with the following assumptions : (i) incoming wave properties do not change during a spacecraft rotation (~3 seconds)parameter set, (ii) radio sources are unpolarized (U=V=Q=0), (iii) galaxy radio emission is not subtracted, (iv) radio sources have an uniform brightness distribution, (v) Z antennas are not tilted