NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header

Atmospheric Propagation Spectral Amplitudes


Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)

Time span: 1978-12-21 to 1979-02-26


These data are processed digital data obtained from the Deep Space Radio telemetry and then supplied to the PI for the Atmospheric Propagation Experiment for the Probes on Pioneer Venus. They are contained in five notebooks labeled 13-17 inclusive. Notebook 13 contains files marked Box 1 through 5 inclusive. These boxes designate the boxes of punched cards that were produced when the PI read the printed lists (from the telemetry) in order to make these digital data manually. In the notebooks they are in printout form. These in turn have been microfilmed and are available from NSSDC in that format. Formats are given early in Notebook 13 where the original lists are included. These are labeled in decibels and are just as the PI received them from NASA-JPL in their original form. Notebooks 14 through 17 are labeled "Probe Spectra" and there is one notebook for each of the four Probes (Large, Small 1, Small 2 and Small 3). In each case there is a large body of 1,024 numbers packed together in a 32X32 array of 4-digit codes. Each array represents the spectrum of signal-plus-noise for 10 s as derived by John Armstrong. Each set of four digits gives amplitude in thousandths of decibels. The data are based on the open-loop recordings from Deep Space Station 14. The absolute level is arbitrary. The first value is the Ground Received Time in UT seconds; second value is the amplitude estimate in decibels and is based on power measured in the in-phase and quadrature channels with the center frequency of the filters guided by a phase lock loop. Next, the date-time group is given, followed by the number of points (1,024) and the bandwidth (1017.5 Hz). On the next line is given the time of year in seconds. Since this data set contains data from each of the four Probes noted above, it is listed (and described identically) under each of the NSSDC IDs 78-078D-11A, 78-078E-07A, 78-078F-07A, and 78-078G-07A. Users of these data are advised to contact John Armstrong at JPL. Results from these data are found in Geophys. Res. Letters, v. 7, n. 7, pp. 521-524, 1980.



NameRoleOriginal AffiliationE-mail
Dr. Thomas A. CroftGeneral ContactSRI
[] NASA Logo -