Data Access
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. An IPS 5D ionosonde has been sounding since 01/01/2004 at Learmonth. The 5D vertical sounding ionosondes normally sweep in frequency from about 1 to 21.5 MHz. Frequency step resolution for the 5D is 5kHz, 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, cleaned and the cleaned ionogram is transfered to SWS Sydney head office for autoscaling and further analysis. The raw ionogram file is recorded in a DVD monthly, which will be posted to Sydney SWS head office every month. SWS WDC archives all raw ionogram files and cleaned ionogram files. During 25/11/1994-28/01/2010, Learmonth also had an Lowell ionosonde. The Learmonth digital clean ionogram data is available since 01/01/2004, and digital raw ionogram data since 25/11/1994. The Learmonth 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 avalable since 01/01/2004. The Learmonth median data of foF2 and M(3000)F2 are available since 01/2004.
Version:2.2.3
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. An IPS 5D ionosonde has been sounding since 01/01/2004 at Learmonth. The 5D vertical sounding ionosondes normally sweep in frequency from about 1 to 21.5 MHz. Frequency step resolution for the 5D is 5kHz, 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, cleaned and the cleaned ionogram is transfered to SWS Sydney head office for autoscaling and further analysis. The raw ionogram file is recorded in a DVD monthly, which will be posted to Sydney SWS head office every month. SWS WDC archives all raw ionogram files and cleaned ionogram files. During 25/11/1994-28/01/2010, Learmonth also had an Lowell ionosonde. The Learmonth digital clean ionogram data is available since 01/01/2004, and digital raw ionogram data since 25/11/1994. The Learmonth 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 avalable since 01/01/2004. The Learmonth median data of foF2 and M(3000)F2 are available since 01/2004.
| Role | Person | |
|---|---|---|
| 1. | GeneralContact | spase://SMWG/Person/Kehe.Wang |
| 2. | MetadataContact | spase://SMWG/Person/Kehe.Wang |
includes browse display interface, button to get yearly data file and link to data availability chart
includes browse display interface, button to get the median data file and link to data availability chart
includes descriptions of data format of raw ionogram data and clean ionogram data
Softwares to view clean ionogram data with scaling function
Online viewer of Real Time clean ionogram data
FTP access to the raw and clean ionogram data of Learmonth IPS 5D (bri5d) ionosondes
Frequencies used to sonde ionopshere
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.