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

https://doi.org/10.24400/802406/mbdb-0ep4

2022-09-01 16:55:14Z

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

Data provided are publicly available. If used in presentations or publications, please acknowledge Wind/Waves Investigation (K. Issautier and K. Goetz). We recommend the data users to contact the Wind/Waves team early in their study. For reporting purposes, we request bibliography information for any publication, etc., using these data. Please send information on the use of this data to: K. Issautier (PI). We suggest to add the following lines into the acknowledgments: The authors acknowledge CNES (Centre National d'Etudes Spatiales), CNRS (Centre National de la Recherche Scientifique), and Observatoire de Paris for support to the Wind/Waves team and the CDPP (Centre de Données de la Physique des Plasmas) for the provision of the Wind/Waves data. The following paper should also be used to reference: Bougeret et al, Space Science Reviews, 1995, doi: 10.1007/BF00751331

Online

CDF

Sequential sweep number

Sequential sweep number in the file, starting from the first sweep of the current day

Frequency

Frequency of analysis

kHz

1e3>Hz

Sequential number in parent L2 data file

Sequential number in parent L2 data file

Flux density

Absolute flux density measured at the antennas (receiver background removed) : Stokes parameter I

W/m^2/Hz

Wave vector elevation

Elevation of the wave vector in the RTN reference frame centered on Wind spacecraft

degree

0.0174532925>rad

Wave vector azimuth

Azimuth of the wave vector in the RTN reference frame centered on Wind spacecraft

degree

0.0174532925>rad

Radio source angular radius

Radio source angular radius, assuming an uniform brightness distribution.

degree

0.0174532925>rad

Signal modulation rate

Signal modulation rate