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ISIS 1 Topside Sounder Ionograms

ISIS-1 Topside Sounder Ionogram CDFs at NASA's CDAWeb

https://doi.org/10.48322/7njf-d645

2025-12-04 13:29:41Z

These ionograms were digitized from the original ISIS-1 7-track analog telemetry tapes using the facilities of the former Data Evaluation Laboratory at the NASA/GSFC. This data restoration project is headed by Dr. R.F. Benson (NASA/GSFC). Ionograms were digitized at the rate of 40,000 16-bit samples/sec. This sample rate is higher than the Nyquist frequency of 30 kHz. The sample frequency of 40 kHz provides a measurement every 25 microseconds corresponding to an apparent range (c*t/2) interval of 3.75 km. Each ionogram consists of a fixed-frequency and and a swept-frequency portion. The time resolution between ionograms is typically 29 seconds.

Users please acknowledge the Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center, ISIS-1 SFS instrument Principal Investigator J. H. Whitteker and ISIS Data-Restoration project lead Robert F. Benson.

spase://VWO/NumericalData/ISIS1/SFS/ISIS1_Ionogram_CDF_PT29S

spase://VWO/NumericalData/ISIS1/SFS/Ionogram.PT29S

spase://VSPO/NumericalData/ISIS1/SFS/Ionogram/PT29S

Online

Open

CDF

None

Users please acknowledge the Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center, ISIS-1 SFS instrument Principal Investigator J. H. Whitteker and ISIS Data-Restoration project lead Robert F. Benson.

Online

Open

CSV

Users please acknowledge the Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center, ISIS-1 SFS instrument Principal Investigator J. H. Whitteker and ISIS Data-Restoration project lead Robert F. Benson.

ISIS-1 Topside Sounder Average Ionogram over Fairbanks, AK: ULA, Latitude 65, Longitude 212

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1975-01-04 18:15:16Z

1979-09-14 12:06:35Z

ISIS-1 Topside Sounder Average Ionogram over Kashima, Japan: KSH, Latitude 36, Longitude 141

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1978-01-06 04:52:17Z

1981-12-30 16:22:49Z

ISIS-1 Topside Sounder Average Ionogram over Kerguelen Island, France: KER, Latitude -49, Longitude 70

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1983-08-24 15:21:21Z

1983-12-30 15:19:33Z

ISIS-1 Topside Sounder Average Ionogram over Kwajalein, Marshall Islands: KWA, Latitude 9, Longitude 168

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1978-01-03 04:13:25Z

1978-12-30 21:34:08Z

ISIS-1 Topside Sounder Average Ionogram over Orroral, Australia: ORR, Latitude -36, Longitude 149

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1970-01-28 09:47:09Z

1981-08-24 14:00:56Z

ISIS-1 Topside Sounder Average Ionogram over Ottawa, QC, Canada: OTT, Latitude 45, Longitude 284

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1969-01-30 14:50:12Z

1983-12-17 13:08:05Z

ISIS-1 Topside Sounder Average Ionogram over Ottawa, QC, Canada, OTT, Version 2, Latitude 45, Longitude 284, 29 s Data

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1969-01-30 14:50:12Z

1983-12-17 13:07:34Z

ISIS-1 Topside Sounder Average Ionogram over Ouagadougou, Burkina Faso: ODG, Latitude 14, Longitude 359

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1969-02-03 13:27:25Z

1976-06-28 17:19:36Z

ISIS-1 Topside Sounder Average Ionogram over Quito, Equador: QUI, Latitude -1, Longitude 281

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1969-01-31 04:20:04Z

1978-06-22 04:44:35Z

ISIS-1 Topside Sounder Average Ionogram over Resolute Bay, NU, Canada: RES, Latitude 75, Longitude 265

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1969-01-30 21:18:14Z

1976-02-22 19:07:32Z

ISIS-1 Topside Sounder Average Ionogram over Santiago, Chile: SNT, Latitude -33, Longitude 298

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1969-01-31 01:29:39Z

1972-12-25 07:01:13Z

ISIS-1 Topside Sounder Average Ionogram over Sodankyla, Finland: SOD, Latitude 67, Longitude 27

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1977-12-14 22:30:46Z

1979-03-30 14:10:33Z

ISIS-1 Topside Sounder Average Ionogram over Tromso, Norway: TRO, Latitude 70, Longitude 19

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1969-02-05 18:15:49Z

1969-12-28 15:12:00Z

ISIS-1 Topside Sounder Average Ionogram over Winkfield, United Kingdom: WNK, Latitude 51, Longitude 359

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1969-02-03 01:02:10Z

1975-07-18 05:06:36Z

ISIS-1 Topside Sounder Average Ionogram over Quito, Equador, Version 2: QUI, Latitude -1, Longitude 281

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1976-01-26 22:51:04Z

1976-07-16 10:49:12Z

ISIS-1 Topside Sounder Average Ionogram over Fairbanks, AK, ULA, Version 2, Latitude 65, Longitude 212, 29 s Data

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1975-01-04 18:15:50Z

1979-09-14 12:06:02Z

ISIS-1 Topside Sounder Average Ionogram over Quito, Equador, QUI, Version 2, Latitude -1, Longitude 281, 29 s Data

This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.

1969-01-31 04:20:04Z

1972-03-29 04:05:42Z