2.3.2 spase://ASWS/NumericalData/Ionogram/Wat_Ionogram Australian Space Weather Services Watheroo Ionogram 2021-03-29T17:14:50Z Ionograms are an image of frequency versus time delay (virtual height) of HF echoes from the ionosphere recorded by an ionosonde. An ionosonde is a swept frequency HF pulsed radar used to monitor the ionosphere. SWS WDC has archived ionogram data from 26 stations, 12 of them are still active at present. A vertical analog ionosonde had been installed at Watheroo and sounded since 31/05/1938 to 13/03/1959. The vertical sounding ionosondes normally sweep in frequency from about 1.0 to 21.5 MHz. Frequency step resolution is 5 kHz, with up to 4095 steps available. The step interval is variable, becoming more coarse at higher frequencies as ionograms are generally displayed on a logarithmic scale. Every five minutes, a Ionogram data file is recorded, The raw ionogram is recorded in a film, which will be posted to Sydney SWS head office every month. SWS manually scaled and archived all ionogram films. There is no digital raw or clean ionogram data for Watheroo. The Watheroo scaled hourly ionospheric data include parameters of foF2, foF1, FoE, foEs, fbEs, fmin, fxl, f'scaling F/s, M(3000)F2, h'F2, h'F, h'E, h'Es, h'Scaling R/S and Type Es. They are available since 31/05/1938 to 13/03/1959. The Watheroo median data of foF2 and M(3000)F2 are available since 05/1938 to 03/1959. Watheroo station is in operation from July of 1935 to March of 1959. Since April of 1959 Watheroo was replaced by Mundaring Observatory station. We are thankful to the Space Weather Network, Bureau of Meteorology of Australia for the observations of Watheroo ionogram data. spase://ASWS/Person/Kehe.Wang GeneralContact spase://ASWS/Person/Kehe.Wang MetadataContact spase://SMWG/Person/Lee.Frost.Bargatze MetadataContact Documentation (not with most browsers) https://downloads.sws.bom.gov.au/wdc/wdc_ion_archive/doc/ includes descriptions of data format of raw ionogram data, clean ionogram data and scaled data en spase://SMWG/Repository/SWS Online Open World Data Centre: Data Display and Download: Hourly Ionospheric Data https://www.sws.bom.gov.au/World_Data_Centre/1/3 includes browse display interface, button to get yearly data file and link to data availability chart en Text GZIP spase://SMWG/Repository/SWS Online Open World Data Centre: Data Display and Download: Monthly Median Ionospheric Data https://www.sws.bom.gov.au/World_Data_Centre/1/4 includes browse display interface, button to get the median data file and link to data availability chart en Text None spase://SMWG/Repository/SWS Online Open Access to scaled data (not with most browsers) https://downloads.sws.bom.gov.au/wdc/iondata/au/watheroo/ Access to the scaled ionospheric data of Watheroo ionosondes en Binary ZIP The manually scaled data is calibrated and the autoscaled data is uncalibrated. spase://ASWS/Instrument/Ground/Watheroo/Ionosonde Waves.Active 1938-05-31T00:00:00Z 1959-03-13T00:00:00Z The earliest scaled ionospheric data since 31/05/1938. RadioFrequency Earth.NearSurface.Ionosphere Ionogram Ionospheric data Ionosphere Median ionospheric data Hourly ionospheric data Scaled parameters Frequency Frequencies used to sonde ionopshere PT60M MHz Electromagnetic Directional Group Frequency RadioFrequency 1.0 21.5 MHz Virtual Height The apparent height of an ionospheric layer deduced from the time delay of a reflected radio pulse upon the assumption that it travelled at the speed of light over its entire path. However, the radio wave actually slows down as it is refracted so that the virtual height is greater than the true height of the refracting layer. PT60M km 50 1000 Other