Data Set Information
|
DATA_SET_NAME |
VG1 JUP PRA RESAMPLED SUMMARY BROWSE
48SEC V1.0
|
DATA_SET_ID |
VG1-J-PRA-4-SUMM-BROWSE-48SEC-V1.0
|
NSSDC_DATA_SET_ID |
|
DATA_SET_TERSE_DESCRIPTION |
This data set consists of edited browse data originally obtained from the
VG1 PRA instrument near Jupiter. Data are provided for 70 instrument
channels covering the range from 1.2 kHz to 1326 kHz in uniform 19.2 kHz
steps, each 1 kHz wide.
|
DATA_SET_DESCRIPTION |
Data Set Overview
=================
Instrument P.I. : James W. Warwick
Data Supplier : Michael L. Kaiser
Data sampling rate : 48 seconds
Data Set Start Time : 1979-01-06T00:00:48.000Z
Data Set Stop Time : 1979-04-13T23:58:24.000Z
This data set consists of edited browse data derived from an
original data set obtained from the Voyager 1 Planetary Radio
Astronomy (PRA) instrument in the vicinity of Jupiter. Data
are provided for 70 instrument channels covering the range from
1.2 kHz to 1326 kHz in uniform 19.2 kHz steps, each 1 kHz wide.
Data are included for the period 1979-01-06 00:00:48 through
1979-04-13 23:58:24. In order to produce this data set from
the original raw PRA data, several steps have been taken:
1. The PRA operates in a variety of modes; data from modes in
which the receiver does not scan rapidly through its frequency
range have been removed;
2. The data have been calibrated as best we know how;
3. The data have been split into Left Hand Circular (LHC) and
Right Hand Circular (RHC) components;
4. The data have been binned into 48-second intervals.
Thus, values at a given channel are separated in time by an
increment of 48 seconds; each 48-second time interval has
associated with it a value for LHC polarization and one for RHC
polarization.
During data gaps, the entire record is absent from the data
set; that is, missing records have not been zero-filled or
otherwise marked. Bad data within a record is indicated by the
value zero, which cannot otherwise occur.
Each datum is returned as a 16-bit quantity; it represents the
mean power received in the given channel at the specified time
and polarization. The returned quantity is the value in mB
about a reference flux density. To convert a returned quantity
to flux, use the formula:
flux = 7.0x10^(-22)x10^(mB/1000) W m-2 Hz-1
Parameters
==========
Data Set Parameter 'RADIO WAVE SPECTRUM'
----------------------------------------
Data Set Parameter Name : RADIO WAVE SPECTRUM
Data Set Parameter Unit : MILLIBEL
Sampling Parameter Name : TIME
Sampling Parameter Unit : SECOND
Sampling Parameter Resolution : 0.001
Sampling Parameter Interval : 48
Minimum Available Sampling Int : 12
Noise Level : 2400
A set of derived parameters consisting of power fluxes at
various contiguous frequencies over a range of frequencies.
Millibels may be converted to watts/m**2/Hz by using the
formula for flux indicated above.
Source Instrument Parameters
============================
Instrument Host ID : VG1
Data Set Parameter Name : RADIO WAVE SPECTRUM
Instrument Parameter Name : WAVE FLUX DENSITY
ELECTRIC FIELD WAVEFORM
ELECTRIC FIELD COMPONENT
MAGNETIC FIELD COMPONENT
WAVE ELECTRIC FIELD INTENSITY
WAVE MAGNETIC FIELD INTENSITY
Important Instrument Parameters : 1 (for all parameters)
Data Coverage
=============
Filename Records Start Stop
-------------------------------------------------------------------
T790106 1565 1979-01-06T00:00:48.000Z 1979-01-06T23:59:12.000Z
T790107 1430 1979-01-07T00:01:36.000Z 1979-01-07T23:59:12.000Z
T790108 1454 1979-01-08T00:01:36.000Z 1979-01-08T23:59:12.000Z
T790109 1518 1979-01-09T00:01:36.000Z 1979-01-09T23:59:12.000Z
T790110 1517 1979-01-10T00:01:36.000Z 1979-01-10T23:59:12.000Z
T790111 1522 1979-01-11T00:01:36.000Z 1979-01-11T23:59:12.000Z
T790112 1460 1979-01-12T00:01:36.000Z 1979-01-12T23:25:36.000Z
T790113 298 1979-01-13T07:27:12.000Z 1979-01-13T23:58:24.000Z
T790114 1460 1979-01-14T00:00:48.000Z 1979-01-14T23:59:12.000Z
T790115 1535 1979-01-15T00:01:36.000Z 1979-01-15T23:59:12.000Z
T790116 1424 1979-01-16T00:01:36.000Z 1979-01-16T23:59:12.000Z
T790117 1442 1979-01-17T00:01:36.000Z 1979-01-17T23:59:12.000Z
T790118 1440 1979-01-18T00:01:36.000Z 1979-01-18T23:59:12.000Z
T790119 1371 1979-01-19T00:01:36.000Z 1979-01-19T23:59:12.000Z
T790120 1396 1979-01-20T00:01:36.000Z 1979-01-20T23:59:12.000Z
T790121 1540 1979-01-21T00:01:36.000Z 1979-01-21T23:58:24.000Z
T790122 1551 1979-01-22T00:00:48.000Z 1979-01-22T23:59:12.000Z
T790123 1039 1979-01-23T00:01:36.000Z 1979-01-23T23:59:12.000Z
T790124 1407 1979-01-24T00:01:36.000Z 1979-01-24T23:58:24.000Z
T790125 1515 1979-01-25T00:01:36.000Z 1979-01-25T23:59:12.000Z
T790126 1575 1979-01-26T00:01:36.000Z 1979-01-26T23:59:12.000Z
T790127 1556 1979-01-27T00:01:36.000Z 1979-01-27T23:59:12.000Z
T790128 1578 1979-01-28T00:01:36.000Z 1979-01-28T23:59:12.000Z
T790129 1602 1979-01-29T00:01:36.000Z 1979-01-29T23:57:36.000Z
T790130 1625 1979-01-30T00:01:36.000Z 1979-01-30T23:59:12.000Z
T790131 1775 1979-01-31T00:00:48.000Z 1979-01-31T23:59:12.000Z
T790201 1751 1979-02-01T00:00:48.000Z 1979-02-01T23:59:12.000Z
T790202 1704 1979-02-02T00:00:48.000Z 1979-02-02T23:24:48.000Z
T790203 1250 1979-02-03T06:25:36.000Z 1979-02-03T23:59:12.000Z
T790204 1607 1979-02-04T00:00:48.000Z 1979-02-04T23:59:12.000Z
T790205 1659 1979-02-05T00:00:48.000Z 1979-02-05T23:59:12.000Z
T790206 1409 1979-02-06T00:00:48.000Z 1979-02-06T23:59:12.000Z
T790207 1648 1979-02-07T00:00:48.000Z 1979-02-07T23:58:24.000Z
T790208 1676 1979-02-08T00:00:00.000Z 1979-02-08T23:59:12.000Z
T790209 1219 1979-02-09T00:00:48.000Z 1979-02-09T23:59:12.000Z
T790210 1604 1979-02-10T00:00:48.000Z 1979-02-10T23:24:00.000Z
T790211 1190 1979-02-11T06:24:48.000Z 1979-02-11T23:57:36.000Z
T790212 1678 1979-02-12T00:06:24.000Z 1979-02-12T23:59:12.000Z
T790213 1655 1979-02-13T00:00:48.000Z 1979-02-13T23:59:12.000Z
T790214 1457 1979-02-14T00:00:48.000Z 1979-02-14T23:59:12.000Z
T790215 1661 1979-02-15T00:01:36.000Z 1979-02-15T23:59:12.000Z
T790216 1533 1979-02-16T00:00:48.000Z 1979-02-16T23:59:12.000Z
T790217 1678 1979-02-17T00:00:48.000Z 1979-02-17T23:59:12.000Z
T790218 1692 1979-02-18T00:00:48.000Z 1979-02-18T23:59:12.000Z
T790219 1611 1979-02-19T00:00:48.000Z 1979-02-19T23:59:12.000Z
T790220 1600 1979-02-20T00:00:48.000Z 1979-02-20T23:23:12.000Z
T790221 1272 1979-02-21T01:24:00.000Z 1979-02-21T23:59:12.000Z
T790222 1730 1979-02-22T00:00:48.000Z 1979-02-22T23:59:12.000Z
T790223 1764 1979-02-23T00:00:48.000Z 1979-02-23T23:59:12.000Z
T790224 1645 1979-02-24T00:00:48.000Z 1979-02-24T23:59:12.000Z
T790225 1700 1979-02-25T00:00:48.000Z 1979-02-25T23:59:12.000Z
T790226 1679 1979-02-26T00:00:48.000Z 1979-02-26T23:59:12.000Z
T790227 1710 1979-02-27T00:00:48.000Z 1979-02-27T23:59:12.000Z
T790228 1697 1979-02-28T00:00:48.000Z 1979-02-28T23:58:24.000Z
T790301 1674 1979-02-29T00:00:00.000Z 1979-02-29T23:58:24.000Z
T790302 1694 1979-03-02T00:00:00.000Z 1979-03-02T23:59:12.000Z
T790303 1381 1979-03-03T00:00:48.000Z 1979-03-03T23:59:12.000Z
T790304 1700 1979-03-04T00:00:48.000Z 1979-03-04T23:59:12.000Z
T790305 1701 1979-03-05T00:00:48.000Z 1979-03-05T23:59:12.000Z
T790306 1661 1979-03-06T00:00:48.000Z 1979-03-06T23:59:12.000Z
T790307 1726 1979-03-07T00:00:48.000Z 1979-03-07T23:59:12.000Z
T790308 1700 1979-03-08T00:00:48.000Z 1979-03-08T23:59:12.000Z
T790309 1714 1979-03-09T00:00:48.000Z 1979-03-09T23:59:12.000Z
T790310 1635 1979-03-10T00:00:48.000Z 1979-03-10T23:59:12.000Z
T790311 1718 1979-03-11T00:00:48.000Z 1979-03-11T23:59:12.000Z
T790312 1676 1979-03-12T00:00:48.000Z 1979-03-12T23:59:12.000Z
T790313 1731 1979-03-13T00:00:48.000Z 1979-03-13T23:59:12.000Z
T790314 1709 1979-03-14T00:00:48.000Z 1979-03-14T23:59:12.000Z
T790315 1654 1979-03-15T00:00:48.000Z 1979-03-15T23:58:24.000Z
T790316 1617 1979-03-16T00:00:00.000Z 1979-03-16T23:59:12.000Z
T790317 1670 1979-03-17T00:00:48.000Z 1979-03-17T23:54:24.000Z
T790318 1667 1979-03-18T00:06:24.000Z 1979-03-18T23:58:24.000Z
T790319 1674 1979-03-19T00:00:48.000Z 1979-03-19T23:59:12.000Z
T790320 1674 1979-03-20T00:00:48.000Z 1979-03-20T23:59:12.000Z
T790321 1664 1979-03-21T00:00:48.000Z 1979-03-21T23:59:12.000Z
T790322 1647 1979-03-22T00:00:48.000Z 1979-03-22T23:59:12.000Z
T790323 1676 1979-03-23T00:00:48.000Z 1979-03-23T23:59:12.000Z
T790324 1669 1979-03-24T00:00:48.000Z 1979-03-24T23:59:12.000Z
T790325 1685 1979-03-25T00:00:48.000Z 1979-03-25T23:59:12.000Z
T790326 1366 1979-03-26T00:00:48.000Z 1979-03-26T23:59:12.000Z
T790327 660 1979-03-27T00:00:48.000Z 1979-03-27T09:09:36.000Z
T790328 1354 1979-03-28T00:20:00.000Z 1979-03-28T23:59:12.000Z
T790329 1692 1979-03-29T00:00:48.000Z 1979-03-29T23:59:12.000Z
T790330 1651 1979-03-30T00:00:48.000Z 1979-03-30T23:59:12.000Z
T790331 1666 1979-03-31T00:00:48.000Z 1979-03-31T23:58:24.000Z
T790401 1666 1979-03-32T00:00:00.000Z 1979-03-32T23:59:12.000Z
T790402 1570 1979-04-02T00:00:48.000Z 1979-04-02T23:59:12.000Z
T790403 1652 1979-04-03T00:00:48.000Z 1979-04-03T23:53:36.000Z
T790404 1636 1979-04-04T00:01:36.000Z 1979-04-04T23:59:12.000Z
T790405 1140 1979-04-05T00:00:48.000Z 1979-04-05T23:59:12.000Z
T790406 1678 1979-04-06T00:00:48.000Z 1979-04-06T23:59:12.000Z
T790407 1622 1979-04-07T00:00:48.000Z 1979-04-07T23:59:12.000Z
T790408 1695 1979-04-08T00:00:48.000Z 1979-04-08T23:59:12.000Z
T790409 1433 1979-04-09T00:00:48.000Z 1979-04-09T20:34:24.000Z
T790410 1250 1979-04-10T05:28:48.000Z 1979-04-10T23:20:00.000Z
T790411 287 1979-04-11T14:03:12.000Z 1979-04-11T23:59:12.000Z
T790412 1671 1979-04-12T00:00:48.000Z 1979-04-12T23:59:12.000Z
T790413 1601 1979-04-13T00:00:48.000Z 1979-04-13T23:58:24.000Z
|
DATA_SET_RELEASE_DATE |
1998-05-01T00:00:00.000Z
|
START_TIME |
1979-01-06T12:00:48.000Z
|
STOP_TIME |
1979-04-13T11:58:24.000Z
|
MISSION_NAME |
VOYAGER
|
MISSION_START_DATE |
1972-07-01T12:00:00.000Z
|
MISSION_STOP_DATE |
N/A (ongoing)
|
TARGET_NAME |
JUPITER
|
TARGET_TYPE |
PLANET
|
INSTRUMENT_HOST_ID |
VG1
|
INSTRUMENT_NAME |
PLANETARY RADIO ASTRONOMY RECEIVER
|
INSTRUMENT_ID |
PRA
|
INSTRUMENT_TYPE |
RADIO SPECTROMETER
|
NODE_NAME |
Planetary Plasma Interactions
|
ARCHIVE_STATUS |
ARCHIVED
|
CONFIDENCE_LEVEL_NOTE |
Confidence Level Overview
=========================
This data set includes all the available low-rate scanning mode
data for the frequency range below 1326 kHz for the time
interval covered. Known bad data have been set to zero. Data
which appear to exceed the Full Scale Deflection (FSD) of the
instrument (i.e. the most intense signal which can be measured
reliably) have also been set to a zero (should they occur).
Planetary Radio Astronomy (PRA) suffers from interference from
many other instruments aboard the spacecraft. No attempt had
been made to remove these interferences in this data set. Two
obvious examples are the 136 and 193 kHz channels which are
nearly always contaminated by interference.
The separation into LHC and RHC polarization components is
performed on the basis of the polarization of the incoming wave
as perceived by the instrument. This takes into account
neither the antenna transfer function nor the spacecraft
orientation with respect to the source. In general, the
mapping of perceived polarization back to emitted polarization
cannot be solved without a knowledge of both of these factors,
as well as a knowledge of the type of polarization coming from
the source region (e.g. is it linear or circularly
polarized?).
Most planetary emissions are circularly polarized. Below is a
table showing the response of the experiment to a low frequency
(100 kHz) LHC wave. The response does not change much up to
about 5 MHz.
The coordinate system used is: THETA == 0 is along the MAG
boom; PHI == 0 is the bisector of the two PRA antennas. The
third column is the apparent value of the left hand component
as perceived by the receiver. That is, a value of +1.0
indicates that the incoming LHC wave is correctly detected as a
pure LHC wave. A value of -1.0 will be detected as being of
the correct strength, but incorrect polarity. A value of, say,
0.6 indicates that the total energy is split 60% into the
apparent LHC component and 40% into the apparent RHC
component.
|
CITATION_DESCRIPTION |
Kaiser, M.L., VG1-J-PRA-4-SUMM-BROWSE-48SEC-V1.0,
VG1 JUP PRA RESAMPLED SUMMARY BROWSE 48SEC V1.0,
NASA Planetary Data System, 1998.
|
ABSTRACT_TEXT |
This data set consists of edited browse data derived from an
original data set obtained from the Voyager 1 Planetary Radio
Astronomy (PRA) instrument in the vicinity of Jupiter. Data
are provided for 70 instrument channels covering the range from
1.2 kHz to 1326 kHz in uniform 19.2 kHz steps, each 1 kHz wide.
Data are included for the period 1979-01-06 00:00:48 through
1979-04-13 23:58:24.
|
PRODUCER_FULL_NAME |
MICHAEL L. KAISER
|
SEARCH/ACCESS DATA |
Planetary Plasma Interactions Website
|