ResourceID

spase://NASA/NumericalData/ISIS2/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 2 (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. (

Version:2.3.2

ResourceID

spase://NASA/NumericalData/ISIS2/SFS/TOPS

ResourceHeader

ResourceName

ISIS 2 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 2 (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

Role | Person | StartDate | StopDate | Note | |
---|---|---|---|---|---|

1. | GeneralContact | spase://SMWG/Person/Elizabeth.D.Hewens | |||

2. | GeneralContact | spase://SMWG/Person/Dieter.K.Bilitza |

PriorIDs

spase://VSPO/NumericalData/ISIS 2/SFS/NEPROF_TOPS

spase://VSPO/NumericalData/ISIS2/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

I2_NEPROF_TOPS

Description

I2_NEPROF_TOPS

Format

Text

AccessInformation

RepositoryID

Availability

Online

AccessRights

Open

AccessURL

Name

CDAWeb HAPI Server

URL

Style

HAPI

ProductKey

I2_NEPROF_TOPS

Description

Web Service to this product using the HAPI interface.

Format

CSV

InstrumentIDs

MeasurementType

Profile

TemporalDescription

TimeSpan

StartDate

1971-04-08 22:27:48

StopDate

1979-08-27 17:52:25

ObservedRegion

Earth.NearSurface.Ionosphere