Willis Island Ionospheric Scintillation Monitor
SPASE version 2.2.3
Numerical Data Product: Australian Space Weather Forecasting Centre Willis Island Ionospheric Scintillation Monitor
- Resource ID
- spase://ASWS/NumericalData/Ionospheric_Scintillation_Monitor/Wil_Ionospheric_Scintillation_Monitor
- Name
- Australian Space Weather Forecasting Centre Willis Island Ionospheric Scintillation Monitor
- Alternate name
- Description
-
Ionospheric scintillation is a rapid fluctuation of radio-frequency signal phase and/or amplitude, generated as a signal passes through the ionosphere. Scintillation occurs when a radio frequency signal in the form of a plane wave traverses a region of small scale irregularities in electron density. The irregularities cause small-scale fluctuations in refractive index and subsequent differential diffraction (scattering) of the plane wave producing phase variations along the phase front of the signal. As the signal propagation continues after passing through the region of irregularities, phase and amplitude scintillation develops through interference of multiple scattered signals. The Ionospheric Scintillation Monitor in Willis Island was installed in 11/12/2010 and still works now.
- Additional information
-
- World Data Centre: Data Display and Download: Ionospheric Scintillation Monitor
-
includes browse display interface, button to get daily data file and link to data availability chart
- Language
- en
- Documentation
-
includes descriptions of station logfiles, data formats and examples and hardware
- Language
- en
- Real Time Information
-
Online viewer of real time Ionospheric Scintillation Monitor data, Latest Conditions, Regional Map, Recent Scintillation Events.
- Language
- en
- Acknowledgement
-
- Contact
-
Role Person 1. General contact spase://SMWG/Person/Kehe.Wang 2. Metadata contact spase://SMWG/Person/Kehe.Wang - Release date
- 2016-02-25 17:00:00
- Repository
-
- Name
- spase://SMWG/Repository/SWS
- Availability
- Online
- Access rights
- Open
- URL
-
- https access to Ionospheric Scintillation Monitor data
-
https access to the station Ionospheric Scintillation Monitor data data of Willis Island.
- Language
- en
- Format
- Text
- Encoding
- None
- Acknowledgement
- Provider processing level
- The Ionospheric Scintillation Monitor data are processed data and are uncalibrated.
- Instrument
- spase://ASWS/Instrument/Ground/Willis Island/Ionospheric_Scintillation_Monitor
- Measurement type
- Active waves
- Temporal description
-
- Start date
- 2010-12-11 00:00:00
- Relative stop date
- 1 day ago
- Note
-
The earliest Ionospheric Scintillation Monitor data since 11/12/2010. Digital data are current to within a day.
- Observed regions
- Earth.NearSurface.Ionosphere
- Caveats
- Keywords
- GPS
- ISM
- Ionosphere
- Ionospheric Scintillation Monitor
Parameters
Parameter #1
- Name
- S4 Final
- Description
-
S4 is a dimensionless number with a theoretical upper limit of 1.0, commonly estimated over an interval of 60 seconds. There are two defined regimes of amplitude scintillation: weak and strong, which roughly correspond to the type of scattering associated with each. Strong scintillation is generally considered to occur when S4 is greater than ~0.6 and is associated with strong scattering of the signal in the ionosphere. Below this is weak scintillation. An S4 level below 0.3 is unlikely to have a significant impact on GPS.
- Caveats
- Cadence
- 1 minute
- Units
- S4 Final (Ionospheric Amplitude Scintillation Index)
- Valid minimum
- 0.000000
- Valid maximum
- 1.000000
- Quantity
- Electromagnetic
Parameter #2
- Name
- Sigma60
- Description
-
Phase scintillation is quantified by the Prms (or Φrms) index which is defined as the standard deviation of the signal phase over a given time interval. This index is measured either in radians or degrees. A Prms greater than ~ 1° is considered to be strong scintillation. At mid-latitudes, Prms rarely exceeds 1° for more than 1% of the time.
- Caveats
- Cadence
- 1 minute
- Units
- Sigma60 (Ionospheric Phase Scintillation Index)
- Valid minimum
- 0.000000
- Valid maximum
- 1.000000
- Quantity
- Electromagnetic
