Voyager 2 Neptune Planetary Radio Astronomy (PRA) Low-Frequency Receiver Band, Version 1.0, 60 ms High Rate Data

  • Data Set Overview\n* =================\n\nThis Data Set (VG2-N-PRA-2-RDR-HIGHRATE-60MS-V1.0) contains Data acquired by the Voyager 2 Planetary Radio Astronomy (PRA) Instrument during the Neptune Encounter. Since the PRA Instrument is able to observe Planetary Phenomenon at much larger Ranges than other Fields and Particles Experiments, thus the PRA Data cover a variable and longer Encounter Period. PRA Low Band Data provided here cover the entire Neptune Encounter Phase (1989-05-25 to 1989-09-27).\n\nEach File within the Data Set represents a single PRA High Rate Frame, of Duration 48 s. Each File contains a 28 Octet Header, followed by 1280000 Octets of Data.\n\nThe Header Format is described as below:\n\n+----------------------------------------------------------------+\n| Length (bytes) | Name | Contents |\n------------------------------------------------------------------\n| 2 | Year | Year A.D. |\n| 2 | Day | Day of Year, 1 denotes 1 Jan |\n| 1 | Hour | Hour of Day |\n| 1 | Minute | Minute of Hour |\n| 1 | Second | Second of Minute |\n| 1 | Spacecraft | 1 denotes V1, 2 denotes V2 |\n| 2 | Integral FDS | Integer Part of FDS Count |\n| 1 | Fractional FDS | Fractional Part of FDS Count |\n| 4 | Frequency 1 | Frequency of 1st Channel, Hz |\n| 4 | Frequency 2 | Frequency of 2nd Channel, Hz |\n| 4 | Frequency 3 | Frequency of 3rd Channel, Hz |\n| 4 | Frequency 4 | Frequency of 4th Channel, Hz |\n| 1 | Bandwidth | Bandwidth, kHz |\n+----------------------------------------------------------------+\n\nwhere all Values are unsigned, and multi-octet Values are presented with the most significant Byte first.\n\nThe Data are 16 bit Numbers, most significant byte first, with 0 indicating unavailable Data. The Data are presented as a single Stream of 16 bit Numbers. The Frame is logically divided into Lines (although there is no Indication of the Lines within the File). This Terminology comes from the Fact that in this High Rate Mode, the PRA Data are treated exactly as if they were Imaging Data, and a 48 s Image comprises 800 horizontal Scan Lines. Similarly, there are 800 Logical Lines within a PRA Frame. Each Line comprises 800 Values, representing 400 Data Pairs. In the High Rate Mode, the PRA measures the Flux at two Frequencies simultaneously and returns these two Data sequentially. A sample Pair is acquired every (actually every 138.88 µs), through an RC Filter with a 100 µs Time Constant. A single Line comprises 60 µs of Data. Lines are not contiguous in Time. There is a 4444.44 µs Gap between the ending of one Line and the Start of the succeeding Line.\n\nThe PRA samples a Frequency Pair in this Manner for 24 s. It then has the Option of switching to a second Pair for the final 24 s. These Frequencies are designated Frequency 1 through Frequency 4 in the Header. The Data are presented such that the higher of the relevant Frequency Pair is presented first.

Data and Resources

This dataset has no data

Additional Info

Field Value
Maintainer NASA Space Physics Data Facility
Last Updated June 22, 2026, 21:30 (UTC)
Created March 10, 2026, 00:49 (UTC)
accessLevel public
bureauCode {026:00}
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
harvest_object_id 63626138-ce79-4ac2-96a2-93e7bd8f4a2e
harvest_source_id b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title Science Discovery Engine
identifier /SDE/SPASE_JSON/|c85301f1d44dadaa7ebb5fb2f7d5fcd2
license https://www.usa.gov/government-works
modified 2026-06-15T22:15:59Z
programCode {026:000}
publisher PDS PPI
resource-type Dataset
source_datajson_identifier true
source_hash 9733c1897e2c67fa0fb5481bd44a0dd3f5420e502c6e0f76086713efa680bd1f
source_schema_version 1.1
theme {Heliophysics}