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The first radio burst type II detected at Bucharest CALLISTO Station

The solar activity is increasing beyond the predictions for the solar cycle 25. Following a M4 class solar flare in the active region AR12975 occurred at 11:28 UTC, there was a radio burst type II and an Earth direction Coronal Mass Ejection (CME). The type II radio burst was detected and recorded by the CALLISTO radio spectrometer installed at AIRA Bucharest, a custom device for this kind of radio observations, developed by Christian Monstein (IRSOL, Switzerland).

Type II radio are characterized by a slow drift in frequency and two distinct bands of fundamental and harmonic frequencies of the hot plasma emissions. The electrons are accelerated by the shock-wave in front of a CME so these phenomena are strong correlated. In the picture, the blue to red contiguous zones represent the emissions and the other smaller lines and zones are Radio Frequencies Interference (RFI) caused by various terrestrial sources like computers, switching power supply, radio communications, static noise and so on.

A custom software was used to extract the relevant signal from the background noise, provided by Christian Monstein to all e-callisto network stations. More information on: Contact: oblagoi (at)

Published on: Mar 29, 2022

Radio burst type II detected at AIRA

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