| Summary: | CALLISTO (Compound Astronomical Low Frequency Low Cost Instrument for Spectroscopy and Transportable Observatory) is one of the projects from ISWI and initiative of United Nation and NASA as a support to help developing countries to monitor activities of the Sun for the whole day. Today, more than 164 instruments at more than 100 locations use this system to do research on the Sun. The objective of this paper is to show that even the activity from the Sun is not too intense and large, the CALLISTO system can detect the signal, hence the importance of this system is acknowledged. This is as a hint for us to use the antenna as the part of the CALLISTO system to get the full coverage all day long with the contributed data from around the world. A weak Coronal Mass Ejection (CME) with the median velocity of 231 km/s was observed on 9th March 2019 by SOHO coronagraph and detected by CALLISTO system from multiple sites of UK, Switzerland and Italy. This faint CME was not giving the high impact to the Earth's magnetosphere and thus no minor occurrence of the geomagnetic storm. © Published under licence by IOP Publishing Ltd.
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