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ISIS 1 CRC Electron Density Profiles

ResourceID
spase://NASA/NumericalData/ISIS1/SFS/TOPS

Description

This data set, provided by the Communications Research Centre (CRC) in Ottawa, Canada, consists of electron density profiles for the ionosphere above the F2 maximum (topside ionosphere). The data are computed from digital values of frequency and virtual height, scaled from ionograms that are measured by the ISIS 1 (International Satellites for Ionospheric Studies) Swept-Frequency Sounder. The data are ordered chronologically. Telemetry stations are not identified, but satellite location, Greenwich mean time of observation, solar zenith angle at the satellite, dip latitude at the satellite, total electron content down to the lowest height of topside signal reflection (normally near 300 km), and other relevant information is noted with each profile. The format gives sequences of numbers for each point scaled from the ionogram. These sequences include electron density at the successive points, and the coefficients a2, b3, b4, b5, etc. from which geometric heights can be calculated, using formulas 40 and 41 in J. E. Jackson, "The reduction of topside ionograms to electron-density profiles," Proceedings of the IEEE., p. 960, June 1969. These formulas can also be used to calculate interpolated density-height values. A CRC interpolation program (available at NSSDC) can be used with this data set. (

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Details

Version:2.3.2

NumericalData

ResourceID
spase://NASA/NumericalData/ISIS1/SFS/TOPS
ResourceHeader
ResourceName
ISIS 1 CRC Electron Density Profiles
ReleaseDate
2021-04-27 15:38:11Z
Description

This data set, provided by the Communications Research Centre (CRC) in Ottawa, Canada, consists of electron density profiles for the ionosphere above the F2 maximum (topside ionosphere). The data are computed from digital values of frequency and virtual height, scaled from ionograms that are measured by the ISIS 1 (International Satellites for Ionospheric Studies) Swept-Frequency Sounder. The data are ordered chronologically. Telemetry stations are not identified, but satellite location, Greenwich mean time of observation, solar zenith angle at the satellite, dip latitude at the satellite, total electron content down to the lowest height of topside signal reflection (normally near 300 km), and other relevant information is noted with each profile. The format gives sequences of numbers for each point scaled from the ionogram. These sequences include electron density at the successive points, and the coefficients a2, b3, b4, b5, etc. from which geometric heights can be calculated, using formulas 40 and 41 in J. E. Jackson, "The reduction of topside ionograms to electron-density profiles," Proceedings of the IEEE., p. 960, June 1969. These formulas can also be used to calculate interpolated density-height values. A CRC interpolation program (available at NSSDC) can be used with this data set. (

Contacts
RolePersonStartDateStopDateNote
1.GeneralContactspase://SMWG/Person/Elizabeth.D.Hewens
2.GeneralContactspase://SMWG/Person/Dieter.K.Bilitza
PriorIDs
spase://VSPO/NumericalData/ISIS 1/SFS/NEPROF_TOPS
spase://VSPO/NumericalData/ISIS1/SFS/TOPS
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
AccessURL
Name
HTTPS from SPDF
URL
Description

In CDF via HTTP from CDAWeb

Format
CDF
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb
URL
ProductKey
I1_NEPROF_TOPS
Description

I1_NEPROF_TOPS

Format
Text
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
I1_NEPROF_TOPS
Description

Web Service to this product using the HAPI interface.

Format
CSV
InstrumentIDs
MeasurementType
Profile
TemporalDescription
TimeSpan
StartDate
1969-02-01 15:50:12
StopDate
1980-05-30 02:41:08
ObservedRegion
Earth.NearSurface.Ionosphere