16 Feb 2023
 | 16 Feb 2023

An Overview of Solar Radio Type II Bursts through analysis of associated solar and near Earth space weather features during Ascending phase of SC 25

Theogene Ndacyayisenga, Jean Uwamahoro, Jean Claude Uwamahoro, Rabiu Babatunde, Daniel Okoh, Kantepalli Sasikumar Raja, Christian Kwisanga, and Christian Monstein

Abstract. Type II solar radio bursts are the signatures of particle acceleration caused by shock waves in the solar atmosphere and interplanetary space. Being electromagnetic radiation that travel at the speed of light, they can serve as ground observed data to provide early notice of incoming solar storm disturbances. An observational overview of 31 Type II bursts which occurred in the period between May 2021 to December 2022 is made. We analyzed associated parameters such as bandwidth, drift rates, starting frequency to evaluate their dynamical parameters such as the shock and Alfvén speeds to estimate the Alfvén Mach number as well as the coronal magnetic field strength using Rankine-Hugoniot relation. We also evaluated accompanying space weather implication in terms of ionospheric total electron content (TEC) enhancement. At heliocentric distance ∼ 1−2 R⊙, the shock and the Alfvén speeds are in the range 504–1301 km s−1 and 368–837 km s−1, respectively. The Alfvén Mach number is of the order of 1.2 ≤ MA ≤ 1.8 at the same heliocentric distance, and the magnetic field strength shows excellent consistency and could be fit with a single power-law distribution of the type B(r) = 6.56 r −3.92 G. The study finds that 15/31 type II radio bursts are associated with some aspects of space weather such as radio blackouts and/or polar cap absorption events, that are the signature of solar proton enhancement and solar energetic particle events. Observed and analyzed Type II events correlated well with observed ionospheric storm indicated by the TEC enhancement. The findings from this study indicate that through analysis of type II SRBs observed from the ground and their physical features characteristics, it is possible to monitor the current progress of solar cycle 25 and predict the intensity of associated space weather phenomena.

Theogene Ndacyayisenga et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-201', Costas Alissandrakis, 28 Mar 2023
    • AC1: 'Reply on RC1', Theogene Ndacyayisenga, 29 Mar 2023
      • RC2: 'Reply on AC1', Costas Alissandrakis, 31 Mar 2023
        • AC2: 'Reply on RC2', Theogene Ndacyayisenga, 05 Apr 2023
  • RC3: 'Comment on egusphere-2023-201', Anonymous Referee #2, 27 Apr 2023
    • AC3: 'Reply on RC3', Theogene Ndacyayisenga, 16 May 2023
    • AC4: 'Reply on RC3', Theogene Ndacyayisenga, 16 May 2023

Theogene Ndacyayisenga et al.

Theogene Ndacyayisenga et al.


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Short summary
This article reports on an observational overview of 31 Type II bursts observed in cycle 25 from May 2021 to December 2022. The space weather implications in terms of ionospheric total electron content (TEC) enhancement is also evaluated. The findings from this study provide the possibility of tracking the progress of the current solar activity.