Data Access
The ionogram (frequency-height plot) of observation data taken by the ionosonde at Shigaraki MU Observatory in Shiga Prefecture, Japan (34.86N, 136.11E, 385m MSL). The data include reflection height and echo power of electromagnetic waves in a frequency range of 2-18 MHz transmitted by the ionosonde. The reflection height is derived from the observed length of time under the assumption that the transmitted waves propagate with the velocity of light. The echo traces of ordinary or extraordinary mode in the ionogram show several characteristic patterns which reflect electron density structure of the D (80-90 km), E (90-120 km), and F (>120km) layers in the ionosphere. Therefore, several important ionospheric parameters (virtual heights designated as h'E, h'F, and h'F2 and frequencies as foE, foF1, and foF2) for each layer are estimated from the echo traces. Details of these parameters and ionograms have been described in B. W. Reinisch et al. [JASTP, 67, 1054-1062, 2005]. The file names are composed of date and time: (year)(month)(day)(hour)(minute)_ionogram.png (color scale) and (year)(month)(day)(hour)(minute)_ionogram_g.png (grey scale). Local time is used for time data. The horizontal and vertical axes are sweep frequency (2.0-18.0 MHz) and height (50-700 km). The unit of echo power is dBV.
Version:2.5.0
The ionogram (frequency-height plot) of observation data taken by the ionosonde at Shigaraki MU Observatory in Shiga Prefecture, Japan (34.86N, 136.11E, 385m MSL). The data include reflection height and echo power of electromagnetic waves in a frequency range of 2-18 MHz transmitted by the ionosonde. The reflection height is derived from the observed length of time under the assumption that the transmitted waves propagate with the velocity of light. The echo traces of ordinary or extraordinary mode in the ionogram show several characteristic patterns which reflect electron density structure of the D (80-90 km), E (90-120 km), and F (>120km) layers in the ionosphere. Therefore, several important ionospheric parameters (virtual heights designated as h'E, h'F, and h'F2 and frequencies as foE, foF1, and foF2) for each layer are estimated from the echo traces. Details of these parameters and ionograms have been described in B. W. Reinisch et al. [JASTP, 67, 1054-1062, 2005]. The file names are composed of date and time: (year)(month)(day)(hour)(minute)_ionogram.png (color scale) and (year)(month)(day)(hour)(minute)_ionogram_g.png (grey scale). Local time is used for time data. The horizontal and vertical axes are sweep frequency (2.0-18.0 MHz) and height (50-700 km). The unit of echo power is dBV.
| Role | Person | StartDate | StopDate | Note | |
|---|---|---|---|---|---|
| 1. | PrincipalInvestigator | spase://IUGONET/Person/Mamoru.Yamamoto | |||
| 2. | MetadataContact | spase://IUGONET/Person/RISH.Metadata.Management.Group | |||
| 3. | TechnicalContact | spase://IUGONET/Person/Noriko.Hashiguchi |
Date in the form YYYY-MM-DD where YYYY= Gregorian Year AD, MM = month of year (01-12), and DD = day of month (01-31).
Time in the form hh:mm where hh = hour of day (0-23) and mm = minute of hour (00-59). Local time (UT+09:00:00) is used for time data.
Minute (local time: UT + 09:00:00)
Height
Sweep frequency
Echo power