SuperDARN is a network of HF radars (8-20 MHz) used to study the convection in the Earth's...
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Transcript of SuperDARN is a network of HF radars (8-20 MHz) used to study the convection in the Earth's...
SuperDARN is a network of HF radars (8-20 MHz) used to study the convection in the Earth's ionosphere at altitudes between 90 and 400 km and at magnetic latitudes between 60° and 90° (each radar has 16 azimuthal beams and 75 ranges).
SuperDARN developed in the last 12 years.
and 7 in the southern hemisphere.
At present, 10 radars operate in the northern hemisphere
Temporal Response of Ionospheric Convection to Solar Wind Transitions
SuperDARN Science highlights.
Imaging High-Latitude Ionospheric Convection
Determination of Global Poynting Flux and Joule Heating
Global Detection of Atmospheric Gravity Waves and Planetary Waves
Measurement of Cross-Polar-Cap Potential Drop
Magnetic Reconnection Science
Flow Transients and Variability
Conjugate Studies of Ionospheric and Magnetospheric Convection
Ionospheric Plasma Instabilities
ULF Pulsations
Magnetic Conjugacy
Bz < 0
Bz > 0
Magnetic reconnection in the magnetosphere.
12 MLT
Imaging High-Latitude Ionospheric Convection
SphericalharmonicsJHUAPLmodelfor CPCpotential
12 MLT
• Counter-rotating convection cells in the dayside high-latitude polar cap [From Huang et al., 2000].
• These patterns had been postulated to occur under northward IMF conditions.
• SuperDARN was the first instrument network to confirm their existence.
Imaging High-Latitude Ionospheric Convection
Near midnight MLT. EquinoxEquatorward moving bands of scatterLow spectral width well defined speeds.Coincident in UT and magnetic latitude.
Several cases found.Origin unknown.
SuperDARN potential maps
Istituto di Fisica dello Spazio Interplanetario, INAF, Roma.
Istituto di Fisica dello Spazio Interplanetario, INAF, Roma.
SuperDARN potential maps
Istituto di Fisica dello Spazio Interplanetario, INAF, Roma.
SuperDARN potential maps
SuperDARN potential mapshttp://superdarn.jhuapl.edu/