Kodaikanal Solar Observatory Radio Spectrograph

We carried out a statistical study of twenty-six type II radio bursts from the Sun observed with the Gauribidanur Low-frequency Solar Spectrograph in the frequency range 85–35 MHz during the period 2009–2019. Our results indicate that the average instantaneous bandwidth of the type II bursts in the above frequency range correlates with the angular width of the associated coronal mass ejections (CMEs). The correlation coefficient is ≈71%. This independently indicates that the coronal type II bursts reported in this work are mostly due to shocks driven by the CMEs. Moreover, it also suggests that the instantaneous bandwidth of the bursts could be due to electron acceleration (leading to type II bursts) occurring simultaneously at multiple locations of differing electron densities (i.e., plasma frequencies) along the shock surrounding the CME.

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New Results from the Spectral Observations of Solar Coronal Type II Radio Bursts

Ramesh

Kathiravan

Natarajan

2022

ApJ

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Circular Polarization Observations of Type II Solar Radio Bursts and the Coronal Magnetic Field

Ramesh

Kathiravan

Chellasamy

2022

ApJ

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It is well known that magnetic field strength (B) in the solar corona can be calculated using the Alfvén Mach number (M A ) and Alfvén speed (v A ) of the magnetohydrodynamic shock waves associated with coronal type II radio bursts. We show that observations of weak circularly polarized emission associated with the harmonic component of the type II bursts provide independent and consistent estimates of B. For the coronal type II burst observed on 2021 October 9, we obtained B ≈1.5 G and ≈1.9 G at a heliocentric distance (r) of ≈1.8 R ⊙, using the above two techniques, respectively.

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Kodaikanal Solar Observatory Radio Spectrograph

Cited by 2 publications

References 40 publications

New Results from the Spectral Observations of Solar Coronal Type II Radio Bursts

New Results from the Spectral Observations of Solar Coronal Type II Radio Bursts

Circular Polarization Observations of Type II Solar Radio Bursts and the Coronal Magnetic Field

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