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DE 2 16ms Retarding Potential Analyzer (RPA) Ion Densities

ResourceID
spase://NASA/NumericalData/DE2/RPA/PT0.016S

Description

This data set contains total ion densities obtained
at 16ms resolution from the DE 2 Retarding Potential Analyzer.
Corrections for spacecraft potential were included in the density
determinations. Data are available in ASCII from nssdcftp and
in CDF format from CDAWeb (as well as CDAWeb plots and lists).
The data span the 18-month DE 2 lifetime, except for a gap from
1981/317 to 1982/057.

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Details

Version:2.2.9

NumericalData

ResourceID
spase://NASA/NumericalData/DE2/RPA/PT0.016S
ResourceHeader
ResourceName
DE 2 16ms Retarding Potential Analyzer (RPA) Ion Densities
AlternateName
Dynamics Explorer 2 RPA Ion Density
AlternateName
DE-B RPA Ion Density
ReleaseDate
2020-07-07 21:14:32Z
Description

This data set contains total ion densities obtained
at 16ms resolution from the DE 2 Retarding Potential Analyzer.
Corrections for spacecraft potential were included in the density
determinations. Data are available in ASCII from nssdcftp and
in CDF format from CDAWeb (as well as CDAWeb plots and lists).
The data span the 18-month DE 2 lifetime, except for a gap from
1981/317 to 1982/057.

Acknowledgement
Please acknowledge the RPA Principal Investigators, Drs. W.B. Hanson (original P.I.) and R.A. Heelis
Contacts
RolePerson
1.PrincipalInvestigatorspase://SMWG/Person/Roderick.A.Heelis
2.PrincipalInvestigatorspase://SMWG/Person/William.B.Hanson
3.MetadataContactspase://SMWG/Person/James.M.Weygand
4.GeneralContactspase://SMWG/Person/Robert.M.Candey
InformationURL
InformationURL
Name
NSSDC's Master Catalog on the Retarding Potential Analyzer (RPA)
URL
Description

The Retarding Potential Analyzer (RPA) measured the bulk ion velocity in the direction of the spacecraft motion, the constituent ion concentrations, and the ion temperature along the satellite path. These parameters were derived from a least squares fit to the ion number flux vs energy curve obtained by sweeping or stepping the voltage applied to the internal retarding grids of the RPA. In addition, a separate wide aperture sensor, a duct sensor, was flown to measure the spectral characteristics of iregularities in the total ion concentration. The measured parameters obtained from this investigation were important to the understanding of mechanisms that influence the plasma; i.e., to understand the coupling between the solar wind and the earth's atmosphere. The measurements were made with a multigridded planar retarding potential analyzer very similar in concept and geometry to the instruments carried on the AE satellites. The retarding potential was variable in the range from approximately +32 to 0 volts. The details of this voltage trace, and whether it was continuous or stepped, depended on the operating mode of the instrument. Specific parameters deduced from these measurements were ion temperature; vehicle potential; ram component of the ion drift velocity; the ion and electron concentration irregularity spectrum; and the concentration of H+, He+, O+, and Fe+, and of molecular ions near perigee. Additional details are in W. B. Hanson et al., Space Sci. Instrum., v. 5, n. 4, p. 503, 1981.

PriorIDs
spase://VMO/NumericalData/DE2/VEFI/Ni/PT0.016S
spase://VSPO/NumericalData/DE2/RPA/PT0.016S
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description

For ftp retrieval of daily CDF files

AccessURL
Name
HTTPS from SPDF
URL
Description

In CDF via HTTP from CDAWeb

Format
CDF
DataExtent
Quantity
10
Units
MB
Per
P1D
Acknowledgement
Please acknowledge the RPA Principal Investigators, Drs. W.B. Hanson (original P.I.) and R.A. Heelis and the Space Physics Data Facility at NASA/GSFC
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb
URL
ProductKey
DE2_DUCT16MS_RPA
Description

For CDAWeb subset, plot and list capabilities

Format
Text
DataExtent
Quantity
1500
Units
KB
Per
PT2H
Acknowledgement
Please acknowledge the RPA Principal Investigators, Drs. W.B. Hanson (original P.I.) and R.A. Heelis and the Space Physics Data Facility at NASA/GSFC
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
VMO UCLA
URL
Description

Dynamics Explorer 2 Retarding Potential Analyzer 16 ms data

Format
Text
Encoding
ASCII
Acknowledgement
NASA; William B. Hanson; VMO
ProcessingLevel
Calibrated
InstrumentIDs
MeasurementType
ThermalPlasma
TemporalDescription
TimeSpan
StartDate
1981-08-03 00:00:00
StopDate
1983-02-17 00:00:00
Cadence
PT0.016S
ObservedRegion
Earth.NearSurface.Ionosphere