2.3.2 spase://NASA/NumericalData/SESAME/KeyParameters/AIS/PT900S SESAME Advanced Ionospheric Sounder, Key Parameters 2021-04-27T15:38:11Z This set of key parameters from the SESAME (Satellite Experiments Simultaneous with Antartic MEasurements) ground-based experiment contains ionospheric parameters that are derived from quarter-hourly ionograms. The three parameters include the lowest plasma frequency recorded and the highest plasma frequency recorded from the E-region (MHz), and the highest plasma frequency recorded from the F-region (MHz). Please see references: (1) Grubb, RN, The NOAA SEL HF Radar system (ionospheric sounder) NOAA Tech Memo ERL SEL-55, Space Environ Lab, Boulder, CO, 1979, (2) Jarvis,MJ and Dudeney ,JR Reduction of ambiguities in HF radar results through a revised receiving array and sounding pattern. Radio Sci 21, 151-158, 1986, and (3) Dudeney, J. R. et. al., Satellite Experiments Simultaneous with Antarctic Measurements (SESAME), Space Science Reviews, Volume 71, Issue 1-4, pp. 705-742, 1995. spase://SMWG/Person/J.R.Dudeney GeneralContact spase://VSPO/NumericalData/P_SESAME_K0_AIS spase://VSPO/NumericalData/SESAME/KeyParameters/AIS/PT900S spase://SMWG/Repository/NASA/GSFC/SPDF Online Open FTPS from SPDF (not with most browsers) ftps://spdf.gsfc.nasa.gov/pub/data/sesame/ais/ HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/sesame/ais/ In CDF via HTTP from CDAWeb CDF Please acknowledge data provider, J.R. Dudeney at the British Antarctic Survey and SPDF when using these data. spase://SMWG/Repository/NASA/GSFC/SPDF Online Open CDAWeb https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=SE_K0_AIS&index=sp_phys SE_K0_AIS Plots, lists, and files from CDAWeb. Name of the data resource:SE_K0_AIS Text spase://SMWG/Repository/NASA/GSFC/SPDF Online Open CDAWeb HAPI Server https://cdaweb.gsfc.nasa.gov/hapi SE_K0_AIS Web Service to this product using the HAPI interface. CSV Calibrated spase://SMWG/Instrument/SESAME/AIS ThermalPlasma 1992-09-01T00:00:00.000Z 2001-10-17T23:59:59.000Z PT900S Earth.NearSurface.Ionosphere