PDS_VERSION_ID = PDS3
RECORD_TYPE = STREAM
OBJECT = TEXT
PUBLICATION_DATE = 1998-05-01
NOTE = "DATASET.TXT contains the data set description."
END_OBJECT = TEXT
END
Data Set Summary
================
Data Set ID: VG1-J-PLS-5-SUMM-ION-INBNDSWIND-96S-V1.0
Instrument: PLS
Instrument P.I.: John D. Richardson
Data Supplier: John D. Richardson
Data sampling rate: 96 seconds
Data Set Start time: 1979-02-15T00:03:10.173Z
Data Set Stop time: 1979-03-02T13:05:31.348Z
Record format
-------------
These files can be read according to the FORTRAN format statement:
'(a24,1x,f7.4,5(1x,f7.1),f7.4,5(1x,f7.1))'
where 'a24' is the time stamp in PDS format: yyyy-mm-ddThh:mm:ss.sssZ.
The individual elements of the time field can be read according to the
statement:
'(i4,4(1x,i2),1x,f6.3,1x)' year, month, day, hour, minute, seconds.
Thus a record may alternatively be read according to the format:
'(i4,4(1x,i2),1x,f6.3,2x,f7.4,5(1x,f7.1),f7.4,5(1x,f7.1))'
Data column descriptions
------------------------
time a24 time in the format yyyy-mm-ddThh:mm:ss.sssZ
mom_den f7.4 moment density
mom_Vr f7.1 moment Vr
mom_Vt f7.1 moment Vt
mom_Vn f7.1 moment Vn
mom_V f7.1 moment speed (magnitude of V)
mom_wth f7.1 moment thermal speed
fit_den f7.4 fit density
fit_Vr f7.1 fit Vr
fit_Vt f7.1 fit Vt
fit_Vn f7.1 fit Vn
fit_V f7.1 fit speed (magnitude of V)
fit_wth f7.1 fit thermal speed
Missing data flag value
-----------------------
Any data column whose value is -9.9999 or -9999.9 (depending upon column
format) is a missing data value.
Data Description
================
Instrument P.I. : John D. Richardson
Data Supplier : John D. Richardson
Data sampling rate : 96 seconds
Data Set Start Time : 1979-02-15T00:03:10.173Z
Data Set Stop Time : 1979-03-02T13:05:31.348Z
This data set contains solar wind plasma data upstream of
Jupiter before the Voyager 1 encounter. Fit and moment
parameters are given; the fit parameters assume a convected
isotropic proton Maxwellian distribution. Use of fit
parameters is recommended as these are normally more accurate.
Parameters
----------
Data Set Parameter 'ION DENSITY'
--------------------------------
Data Set Parameter Name : ION DENSITY
Data Set Parameter Unit : CM**-3
Sampling Parameter Name : TIME
Sampling Parameter Unit : SECOND
Minimum Sampling Parameter : UNK
Maximum Sampling Parameter : UNK
Sampling Parameter Interval : UNK
Minimum Available Sampling Int : UNK
Noise Level : UNK
A derived parameter equaling the number of ions per unit
volume over a specified range of ion energy, energy/charge,
or energy/nucleon. Discrimination with regard to mass and or
charge state is necessary to obtain this quantity, however,
mass and charge state are often assumed due to instrument
limitations.
Many different forms of ion density are derived. Some are
distinguished by their composition (N+, proton, ion, etc.) or
their method of derivation (Maxwellian fit, method of
moments). In some cases, more than one type of density will
be provided in a single data set. In general, if more than
one ion species is analyzed, either by moment or fit, a total
density will be provided which is the sum of the ion
densities. If a plasma component does not have a Maxwellian
distribution the actual distribution can be represented as
the sum of several Maxwellians, in which case the density of
each Maxwellian is given.
Data Set Parameter 'ION TEMPERATURE'
------------------------------------
Data Set Parameter Name : ION TEMPERATURE
Data Set Parameter Unit : EV
Sampling Parameter Name : TIME
Sampling Parameter Unit : SECOND
Minimum Sampling Parameter : UNK
Maximum Sampling Parameter : UNK
Sampling Parameter Interval : UNK
Minimum Available Sampling Int : UNK
Noise Level : UNK
A derived parameter giving an indication of the mean
energy/ion, assuming the shape of the ion energy spectrum to
be Maxwellian (i.e. highest entropy shape). Given that the
ion energy spectrum is not exactly Maxwellian, the ion
temperature can be defined integrally (whereby the mean
energy obtained by integrating under the actual ion energy
spectrum is set equal to the integral under a Maxwellian,
where the temperature is a free parameter for which to
solve), or differentially (whereby the slopes of the actually
ion energy spectrum at various energies are matched to the
slopes of a corresponding Maxwellian). The temperature
parameter is often qualified with a range of applicable
energies. Temperatures can be angularly anisotropic. If the
ions do not have a Maxwellian distribution the actual
distribution can be represented as the sum of several
Maxwellians, each with a separate temperature.
Data Set Parameter 'ION THERMAL SPEED'
--------------------------------------
Data Set Parameter Name : ION THERMAL SPEED
Data Set Parameter Unit : KM/S
Sampling Parameter Name : TIME
Sampling Parameter Unit : SECOND
Minimum Sampling Parameter : UNK
Maximum Sampling Parameter : UNK
Sampling Parameter Interval : UNK
Minimum Available Sampling Int : UNK
Noise Level : UNK
A measure of the velocity associated with the temperature of
the ions. It is formally defined as the Ion Thermal Speed
squared equals two times K (Boltzmann's constant) times T
(temperature of ion) divided by M (ion mass). Each component
of a plasma has a thermal speed associated with it.
Data Set Parameter 'ION VELOCITY'
---------------------------------
Data Set Parameter Name : ION VELOCITY
Data Set Parameter Unit : KM/S
Sampling Parameter Name : TIME
Sampling Parameter Unit : SECOND
Minimum Sampling Parameter : UNK
Maximum Sampling Parameter : UNK
Sampling Parameter Interval : UNK
Minimum Available Sampling Int : UNK
Noise Level : UNK
A derived parameter giving the average speed and direction of
motion of a plasma or plasma component. The velocity can be
obtained by taking the first moment of the distribution
function or by simulating the observations with some known
distribution function, usually a Maxwellian, to the
distribution. Velocities are given in Heliographic (RTN)
coordinates:
R is radially away from sun,
T is in plane of sun's equator and positive in the direction
of solar rotation
N completes right-handed system
Source Instrument Parameters
----------------------------
Instrument Host ID : VG1
Data Set Parameter Name : ION DENSITY
Instrument Parameter Name : ION RATE
Important Instrument Parameters : 1
Instrument Host ID : VG1
Data Set Parameter Name : ION DENSITY
Instrument Parameter Name : ION CURRENT
Important Instrument Parameters : 1
Instrument Host ID : VG1
Data Set Parameter Name : ION VELOCITY
Instrument Parameter Name : ION CURRENT
Important Instrument Parameters : 1
Instrument Host ID : VG1
Data Set Parameter Name : ION TEMPERATURE
Instrument Parameter Name : ION RATE
Important Instrument Parameters : 1
Instrument Host ID : VG1
Data Set Parameter Name : ION THERMAL SPEED
Instrument Parameter Name : ION RATE
Important Instrument Parameters : 1
Instrument Host ID : VG1
Data Set Parameter Name : ION TEMPERATURE
Instrument Parameter Name : ION CURRENT
Important Instrument Parameters : 1
Instrument Host ID : VG1
Data Set Parameter Name : ION THERMAL SPEED
Instrument Parameter Name : ION CURRENT
Important Instrument Parameters : 1
Instrument Host ID : VG1
Data Set Parameter Name : ION DENSITY
Instrument Parameter Name : PARTICLE MULTIPLE PARAMETERS
Important Instrument Parameters : 1
Instrument Host ID : VG1
Data Set Parameter Name : ION TEMPERATURE
Instrument Parameter Name : PARTICLE MULTIPLE PARAMETERS
Important Instrument Parameters : 1
Data Coverage
-------------
Filename Records Start Stop
-------------------------------------------------------------------
T79046 11297 1979-02-15T00:03:10.173Z 1979-03-02T13:05:31.348Z
Confidence Level Overview
-------------------------
Inbound solar wind values should be accurate to within a few
percent for all parameters.