 e-Callisto logo |
IDL-map of current distribution of Callisto instruments in May 2013 Red triangles: locations provide data, orange star: locations do not provide data yet/anymore Statistics: more than 57 instruments in more than 31 locations with users from more than 86 countries |
 Type II burst (Ooty)
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The CALLISTO spectrometer is a programmable heterodyne
receiver
built in the framework of IHY2007 and ISWI by former Radio and Plasma
Physics Group (PI Christian
Monstein) at ETH Zurich, Switzerland. The instrument natively operates between
45 and 870 MHz using a modern,
commercially available broadband cable-TV tuner CD1316 having a
frequency resolution of 62.5 KHz. The data obtained from CALLISTO are
FIT-files with up to 400 frequencies per sweep. The data are
transferred via a RS-232 cable to a computer and saved locally. Time
resolution is 0.25 sec at 200 channels per spectrum
(800
pixels per second). The integration time is 1 msec and the radiometric
bandwidth
is about 300 KHz. The overall dynamic range is larger than
50 dB.
For convenient data handling several IDL- and Python-routines were
written.
Many CALLISTO instruments have already been deployed,
including 5 spectrometers in India (2 in Ooty, 1 in Gauribidanur, 1 in
Pune, 1 in Ahmedabad),
one in Badary near Irkutsk, Russian Federation, two in South Korea, two
in Australia (Perth and Melbourne), one in Hawaii, one in Mexico,
one in Costa Rica, two in
Brazil, three in Mauritius, four in Ireland, one in Czech Republic,
two in Mongolia, three in Germany, two in Alaska, one in Kazakhstan,
one in Cairo, one in
Nairobi, one in Sri Lanka, three in Trieste,
one in Hurbanovo/Slovakia, two in Belgium, two in Finland, 4 in Switzerland, one
in Sardinia, one in Spain, 5
in Malaysia, one in Indonesia, one in Scotland/UK and one in Roztoky/Slovakia.
Through the IHY/UNBSSI and ISWI
instrument deployment program, CALLISTO is able to continuously observe
the solar radio spectrum for 24h per day through all the year. All
Callisto spectrometers together form the e-Callisto network. Callisto
in
addition
is dedicated to do radio-monitoring within its frequency range with
13'200 channels per spectrum. The frequency range can be expanded to
any range by switching-in a heterodyne up- or a down-converter.
Instrument
deployment including education and training of observers was
financially supported by SNF, SSAA, NASA, Institute of Astronomy and
North-South Center of ETH Zurich.
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