is SCINDA ?
Scintillation Network Decision Aid (SCINDA) is a real-time, data driven
communication outage forecast and alert system developed for the United
Air Force Space Command by the Air Force Research Laboratory (AFRL),
Ionospheric Hazards Specification and Forecast Team, Hanscom AFB. Its
is to aid in the specification and prediction of satellite
degradation due to ionospheric scintillation in the equatorial region.
disturbances can cause rapid phase and amplitude fluctuations of
satellite signals observed at or near the earth's surface; these
are known as scintillation. The most intense natural scintillation
during nighttime hours within 20o of the earth's magnetic
region encompassing more than 1/3 of the globe's surface. Scintillation
radio signals up to a few GHz frequency and seriously degrades and
satellite-based navigation and communication systems. SCINDA was
provide regional specification and short-term forecasts of
activity to operational users in real-time.
SCINDA system concept is presently being demonstrated using eight
in South America, Southwest Asia and Southeast Asia (see map).
Scintillation parameters from available UHF (FLTSAT) and
L-band (GOES, GPS) satellite links and ionospheric drift velocities are
measured and recorded at the remote sites. At fifteen minute intervals
reduced parameters are retrieved via internet to Hanscom AFB, where
used to drive a semi- empirical model that produces simple three-color
graphical representations of large-scale equatorial scintillation
and associated communication impact regions. Since February 2002 the
model has been installed at the Air Force
Weather Agency (AFWA), Offutt AFB, NE and the scintillation maps are
to users for proto-type operational support via a secure network (READ