This bundle contains open-loop radio receiver data collected at the
Goldstone (California, USA) 64-m antenna of the NASA Deep Space Network
(DSS-14) during the Voyager 2 encounter with Jupiter on day 1979-191.
The data include samples from receiver outputs at S-band (13 cm
wavelength) and X-band (3.6 cm) in right-circular polarization.  Also
included are calibration measurements collected within a few hours of
the Jupiter observations.  The data supported investigations of the
structure of Jupiter's neutral atmosphere and ionosphere (among other
objectives).

41 original data tapes -- known as Original Data Records (ODRs) --
were delivered to the Voyager Radio Science Team in the Reconstructed
Data Record (REDR) format.  NB: 'ODR' in this context is a raw data
file from the Voyager Jupiter era DSN radio science open loop receivers;
it should not be confused with 'ODR' used elsewhere in PDS (albeit
rarely) to denote a processing level (for example, telemetry packets).

Each original ODR forms the basis for a PDS4 product in the bundle.
The binary file is the first part of the product; but the binary data
are in an archaic binary format, so they have been converted to ASCII
for easier reading.  There is one ASCII table with record header/trailer
data and two ASCII files with the receiver samples -- one with S-band
samples and the other with X-band samples.  These are the second, third,
and fourth parts of each PDS4 product.  Future users will likely prefer
to work with the ASCII files.  Each product also includes a detached
PDS4 label file written in XML and a small ASCII file with terse titles
for the fields in the header/trailer table.  For example, the following
six files constitute one PDS4 product:

  vp095x.odr                       original ODR file (binary)
  vg2j_14mr_1979191t131727.hdr     header/trailer data (ASCII)
  vg2j_14sr_1979191t131727.tab     S-band receiver samples (ASCII)
  vg2j_14xr_1979191t131727.tab     X-band receiver samples (ASCII)
  vg2j_14mr_1979191t131727.xml     PDS4 XML label (ASCII)
  vg2j_14mr_1979191t131727.txt     field headers for hdr file (ASCII)

Each ODR has been processed to give a 'browse' product with a pair of
plots in JPEG format -- one for S-band and one for X-band.  Each
plot contains a histogram of data sample values, a line drawing of
average sample power versus time, a waterfall plot of time-averaged
power spectra, and labeling information.  Plots and their labels may
be found in the Browse directory/collection.

The Miscellaneous collection includes two products with partially
processed data -- one from the ingress occultation and one from the
egress occultation.  Each is a separate PDS4 ASCII table.  These
tables were recovered from holdings of the NASA Space Science Data
Coordinated Archive (NSSDCA).  They give signal amplitude and
'residual frequency' -- the offset of the received signal from its
expected value in the absence of Jupiter's atmosphere. No other raw
or partially processed data from the Voyager 2 Jupiter radio
occultation have been archived previously with either NSSDCA or PDS.

Also included in the bundle are reconstructions of the spacecraft
trajectory and spacecraft high-gain antenna pointing, which was
offset during the Jupiter atmospheric occultation to compensate for
refraction.  Receiver tuning data, included in the ODR header/trailer,
and estimated frequency of the spacecraft ultrastable oscillator
(USO) allow calculation of the exact received frequency at the
ground station.

The Document collection includes a Software Interface Specification
(SIS) for the archive bundle. The SIS (sis_vgj_rs) describes how the
products in this archive were constructed from the original raw data
files - in more detail than can be included here.  The Document
collection also includes a copy of the mission description paper
written by Kolhase and Penzo in 1977. 

All members of the Document collection, including documentation of
the binary formats in the ODR, have been archived elsewhere in PDS
and are considered 'secondary' members of this Document collection.
Although PDS does not require that products be physically reproduced
when they are secondary members, many such products have been
included.  In fact, the entire Calib collection is a secondary
member of this bundle and has been included.  However, members of
the Context collection and documents describing binary ODR formats
have not been reproduced because they are considered 'volatile'
and may be updated at some future time.

This is version 2 of the bundle.  In version 1, the waterfall plots
of time-averaged power spectra were calculated incorrectly.  Also,
the archive SIS described the browse products as being in PDF/A-1b
format when they are actually JPEG files.  The original Browse and
Document collections have been corrected here.  The CALIB_FREQ
collection in version 1 has been renamed the CALIB collection; as
noted above, it is a secondary member of the version 2 bundle where
the primary member is in the Voyager 1 Jupiter bundle.  Many labels
have been corrected and/or improved in version 2.

Dick Simpson
2026-08-08