1. CEDAR Frontiers – Understanding the Polar Cap Ionosphere-Magnetosphere System Canadian High-Arctic Ionospheric Network (CHAIN) Jayachandran P. T., University of New Brunswick, Canada
CHAIN - An array of radio and optical instruments in the polar cap (open field lines) to study the dynamics of the solar wind – magnetosphere – ionospheric interaction for better understanding of the complex Sun Earth system

2. Scientific objectives of CHAIN
Instrument components of CHAIN
6 Canadian Advanced Digital Ionosondes – Alert, Eureka, Resolute Bay,
Cambridge Bay, Iqaluit, and Clyde River
9 GPS dual frequency high data rate receivers – (Alert, Eureka, Grise Fiord,
Resolute Bay, Pond Inlet, Clyde River, Cambridge Bay, Taloyoak, and Iqaluit)
2 Allsky Imagers – Iqaluit and Eureka
3 Meridian Scanning Photometers – Eureka, Clyde River, and Iqaluit
Scientific objectives of CHAIN
Energy and mass transport across the polar cap
Generation and dynamics of ionization structures in the polar cap
Macroscale – Tongue of ionization (>1000 km)
Mesoscale – Polar patches (Few hundred km)
Microscale – Scintillation producing structures (Few km)
Role of ionosphere in M-I coupling

3. Possibilities with CEDAR
AMISR and CHAIN will be complimentary
High-temporal and spatial resolution Total Electron Content (TEC) measurements
Three dimensional ionospheric tomography of ionization as well as thermal structures in the polar cap ionosphere using ground based ionosonde and GPS TEC measurements
Polar cap boundary measurements using the array of photometers
Coarse information about precipitating particle energy in the polar cap ionosphere
Ground-based measurement support for upcoming satellite missions