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Alouette 2 Topside Electron Density Profiles Manually Scaled at CRC

ResourceID
spase://NASA/NumericalData/Alouette2/SFS/PT32S

Description

This data set, provided by the Communications Research Centre (CRC) in Ottawa, Canada, consists of electron density profiles derived from Alouette 2 Sweep-Frequency Sounder for the ionosphere above the F2 maximum (topside ionosphere). The data set was originally provided on an EBCDIC magnetic tape written on an IBM 360 computer. The electron density profiles were computed from digital values of frequency and virtual height, scaled from ionograms. The data are ordered chronologically and include about 11,000 profiles. 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. The ionograms were selected for their scientific interest and comprise only a very small portion of reductions possible from the available ionograms. Data obtained prior to March 9, 1970, are also available on microfiche from NSSDC.

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Details

Version:2.2.2

NumericalData

ResourceID
spase://NASA/NumericalData/Alouette2/SFS/PT32S
ResourceHeader
ResourceName
Alouette 2 Topside Electron Density Profiles Manually Scaled at CRC
ReleaseDate
2020-07-07 21:14:17Z
Description

This data set, provided by the Communications Research Centre (CRC) in Ottawa, Canada, consists of electron density profiles derived from Alouette 2 Sweep-Frequency Sounder for the ionosphere above the F2 maximum (topside ionosphere). The data set was originally provided on an EBCDIC magnetic tape written on an IBM 360 computer. The electron density profiles were computed from digital values of frequency and virtual height, scaled from ionograms. The data are ordered chronologically and include about 11,000 profiles. 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. The ionograms were selected for their scientific interest and comprise only a very small portion of reductions possible from the available ionograms. Data obtained prior to March 9, 1970, are also available on microfiche from NSSDC.

Contacts
RolePerson
1.GeneralContactspase://SMWG/Person/Dieter.K.Bilitza
PriorIDs
spase://VSPO/NumericalData/P_ALOUETTE2_HDR_NEPROF
spase://VSPO/NumericalData/Alouette2/SFS/PT32S
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
ftps://spdf.gsfc.nasa.gov/pub/data/alouette/topside_sounder/crc_ne_profile_cdf/alouette2/
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/alouette/topside_sounder/crc_ne_profile_cdf/alouette2/
Description

In CDF via HTTP from CDAWeb

AccessURL
Name
CDAWeb
URL
https://cdaweb.sci.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=ALOUETTE2_NEPROF_TOPS&index=sp_phys
ProductKey
ALOUETTE2_NEPROF_TOPS
Description

ALOUETTE2_NEPROF_TOPS

Format
CDF
ProviderProcessingLevel
CALIBRATED
InstrumentIDs
spase://SMWG/Instrument/Alouette2/SFS
MeasurementType
ThermalPlasma
TemporalDescription
TimeSpan
StartDate
1965-12-15 09:40:15
StopDate
1972-07-10 22:37:22
Cadence
PT32S
ObservedRegion
Earth.NearSurface.Ionosphere