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Monday, Oct 20 2014 09:41 UT

Ionospheric Irregularities

Australian scintillation observations

Product Description

This display is derived from Ionospheric Scintillation Monitor (ISM) sites in the Australian region. The level of scintillation on the signal from each GPS satellite observed by an ISM is mapped to the approximate location at which the line of sight pierces the ionosphere at 400km. The colours show the 80th percentile of the S4 index over 15 minute intervals and the size of the plot marker indicates the age of the data, with the most recent data shown with larger dots. Scintillation above an S4 index of around 0.3 may begin to interfere with satellite communication and navigation and values above 0.6 may have severe effects.

Target Users

Include industries relying on high-accuracy GNSS positioning: agriculture, surveying, construction, drilling

Data Source

Ground-based Ionospheric Scintillation Monitors

Cadence

10 minutes

Australian GNSS-derived scintillation proxy

Product Description

This display is derived from dual frequency GNSS data from the Australian region. The scintillation proxy index is based on ROTI (variance of the rate of change of TEC), with thresholds determined by levels of ROTI and the occurrence of Loss of Lock (LoL) on a given GNSS satellite over a 1-minute period. Green indicates minimal scintillation activity, while red indicates high levels of scintillation, sufficient to produce high ROTI and a loss of lock over the period. High levels of scintillation may have severe effects on satellite communication and navigation. The observations are mapped to an ionospheric height of 400km to indicate the geographic location where the scintillation most likely occurred. The size of the plot marker indicates the age of the data, with the most recent data shown with larger dots.

Target Users

Include industries relying on high-accuracy GNSS positioning: agriculture, surveying, construction, drilling

Data Source

Ground-based dual-frequency GNSS receivers

Cadence

10 minutes
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