Coronado SolarMax 60 filter is used to observe Sun in Hydrogen alpha wavelength with a bandwidth of 0.7A. Using this H Alpha filter Solar chromospheric activities such as flares and prominences can be observed along the Solar limb. Filaments, Spicula and sun spots on the solar disk can also be viewed through the filter.
H Alpha Filter for solar observations
Annular Solar Eclipse 2010
Observation of Solar Radio burst using e-CALLISTO system
A CALLISTO system was set up at the Arthur C Clarke Institute and connected to the e-CALLISTO global network which observes the solar radio bursts in 24 hours. CALLISTO is the foremost observation facility to investigate celestial objects in radio region in Sri Lanka. The system consists of the CALLISTO spectrometer and controlling software, logarithmic periodic antenna and pre-amplifier. CALLISTO spectrometer is able to detect solar radio bursts in the frequency range of 45 MHz to 870 MHz with a channel resolution of 62.5 kHz. The log-periodic antenna was designed for 7 dBi gain and achieved the voltage standing wave ratio, less than 1.5 which is acquired by the overall impedance of the antenna, 49.3W. The linear polarized antenna is pointing to zenith and the dipoles directed to north-south direction. The system detects solar radio emissions originated by solar flares and corona mass ejections. The radio bursts occurs as emission stripes in the radio spectra and classify from type I to V mainly on drift rate and band width.
Home page : http://www.e-callisto.org