Assessing the spectral characteristics of band splitting type II radio bursts observed by CALLISTO spectrometers
arXiv:2301.13839 · doi:10.1016/j.asr.2022.03.029
Abstract
Metric type II radio bursts are usually early indicators of CME-driven shocks and other space weather phenomena in the solar corona. This paper presents a detailed investigation of the spectral properties of band-splitting type II radio bursts and their association with sunspot number. Using type II radio bursts in a frequency range 20 to 200MHz observed by CALLISTO from 2010 to 2017, it was discovered that the analyzed type II shock height, magnetic field strength, CME shock speed, and Alfven speed synchronize with the trajectory of the solar cycle 24. Also, the study revealed that the onset of the declining phase of solar cycle 24 has the highest electron density. The analysis ascertained that the frequency of type II bursts depicts a bimodal distribution during the study period, with peaks in 2012 and 2015. Further, a good correlation(with correlation factor R=0.87) was obtained between the estimated CME shock speeds from the dynamic spectra, and the associated CME speeds from SOHO-LASCO. Moreover, the study confirmed a significant correlation(R=0.8) between the absolute drift rates and the plasma frequency. Additionally, the study explored that 60% of the type II radio bursts considered in this study emanated from the western longitudes. Hence, these findings emphasize that the temporal dynamics of the physical conditions of band-splitting type II radio are essential parameters in space weather monitoring and forecasting.
arXiv comment20 pages, 8 figures
References in corpus (17)
- Combined STEREO/RHESSI study of CME acceleration and particle acceleration in solar flares
- CALLISTO - A new concept for solar radio
- Height of Shock Formation in the Solar Corona Inferred from Observations of Type II Radio Bursts and Coronal Mass Ejections
- The revised Brussels-Locarno Sunspot Number (1981-2015)
- CME Propagation Characteristics from Radio Observations
- Large scale simulations of solar type III radio bursts: flux density, drift rate, duration and bandwidth
- Coronal Shock Waves, EUV waves, and Their Relation to CMEs. I. Reconciliation of "EIT waves", Type II Radio Bursts, and Leading Edges of CMEs
- The structure of solar radio noise storms
- Strength of the Solar Coronal Magnetic field - A Comparison of Independent Estimates Using Contemporaneous Radio and White-light Observations
- Investigation on the Coronal Magnetic Field Using a Type II Solar Radio Burst
- Observations of Low Frequency Solar Radio Bursts from the Rosse Solar-Terrestrial Observatory
- A Statistical Study of Solar Radio Type III Bursts and Space Weather Implication
- Moving solar radio bursts and their association with coronal mass ejections
- Automated Detection of Solar Radio Bursts using a Statistical Method
- Trends and Characteristics of High-Frequency Type II Bursts Detected by CALLISTO Spectrometers
- Imaging and Spectral Observations of a Type-II Radio Burst Revealing the Section of the CME-Driven Shock that Accelerates Electrons
- Electron acceleration and radio emission following the early interaction of two coronal mass ejections