Researchers discover mysterious source of 'heartbeat-like' radio bursts in a solar fare njit NatureComms
of the two sources, both at an optically-thick frequency 3.4 GHz and an optically-thin frequency 8.4 GHz, increases and decreases repeatedly and in phase, presenting an evident quasi-periodicity and high relation to each other. Furthermore, the temporal evolution of is also found to be approximately synchronous with that of the time derivative of SXR flux, with a time lag of about 13 s . Wavelet analysis provides the periodicity of these curves.
4 GHz, a confident period appears in the range of about 10–20 s between about 21:55 UT and about 21:56 UT; while the period of about 30–60 s appears confidently only in the weak sources from about 21:54 to 21:57 UT . Similarly, the time derivative of SXR flux also presents a period of about 10–20 s around 21:54 UT as well as between about 21:55 UT and about 21:56 UT.
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