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T. Manik, P. Sitompul, M. Batubara, T. Harjana, C. Y. Yatini (Space Sience Center of LAPAN, Indonesia), C. Monstein (Institute of Astronomy, ETH Zurich, Switzerland) |
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Sumedang Observatory (6.91° S, 107.84° E) was established in 1985 as one of solar
observation facility of Space Science Center of Indonesian National Institute of
Aeronautics and Space (LAPAN), located around 40 km, East part of Bandung City, West
Java, Indonesia. Several instrumentations for solar and space observation such as
optical telescopes, radio solar spectrograph, flux gate magnetometer, etc. are
operated there, then an ionosphere sounding system (ionosonde) was also setup
later. In July 2014, a standard Callisto (Compound Astronomical Low-cost
Low-frequency Instrument for Spectroscopy and Transportable Observatory)
spectrometer was installed at Sumedang Observatory for solar radio activity
monitoring. Callisto spectrometer has observation capability in the frequency range
of 45-870 MHz. The Callisto spectrometer receives signal by using a set of 21
elements log-periodic antenna, model CLP5130-1N, pointed to the sun and equipped
with a pre-amplifier. With consider to Radio Frequency Interferences (RFI) measurement which conducted previously,
Callisto spectrometer is operated on frequency ranges of 45-80 MHz and 180-450 MHz,
individually. Observation status and data flow are monitored in on-line from center
office located in Bandung. The data are transferred to central database at FHNW
(Fachhochschule Nordwestschweiz) server every 15 minutes to be appears on
e-Callisto network subsequently. A real time data transfer and data processing
based on Python software also has been developed successfully to be used as a value
input for space weather information and forecasting services (SWIFtS) provided by
LAPAN. On 5th November 2014, Callisto spectrometer at Sumedang observed the first
clear solar radio event, a solar radio burst type II corresponds to CME, indicated
by a strong x-ray event of M7.9 that was informed on by Space Weather Prediction
Center (SWPC) NOAA. Thereafter, Callisto spectrometer at Sumedang also observed
several solar radio burst in various types. This paper describes the system configuration of Callisto
spectrometer installed at Sumedang, RFI measurement and chosen observation
strategy, conducted real time data transfer and processing, several samples of
present result of solar radio burst monitoring at Sumedang, and future development
plan of Callisto spectrometer in Indonesia which will be able to cover 14 hours of
day solar observation. |
