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<p>We have analyzed 20 low-frequencies (LF) type-II radio bursts associated with solar coronal mass ejections (CMEs), coronal holes (CHs), and solar flares observed during the solar cycle 23 and solar cycle 24, which consist of the period of year 1997 to year 2015. A total number of 505 types-II radio bursts were observed during the above period out of which only 20 types II radio bursts have frequencies ≤ 1 MHz. The time duration of 20 LF type II bursts ranges from 5 min to 2020 min. On investigation of 17 type-II bursts associated CMEs, solar flares, and coronal holes we also found that 12 types-II burst related CMEs observed when there were CHs and solar flares within 10° and 5 type-II burst-associated CMEs found when there were CHs and solar flares within 30°, respectively. In this paper we have done statistical analysis of low frequency type II radio bursts and related solar phenomena. The LF type-II radio bursts start after the peak time of associated solar flares. In this paper each LF type-II radio burst and other related solar phenomena are seen and analyzed to understand the origin of LF type-II radio bursts from the Sun in the latest scenario of solar heliophysics.</p>

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Low-Frequency Type II Radio Bursts and Associated Solar Flares, Coronal Holes, and CMEs During 2001 to 2015

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • N. Mittal,
  • V. Verma

摘要

We have analyzed 20 low-frequencies (LF) type-II radio bursts associated with solar coronal mass ejections (CMEs), coronal holes (CHs), and solar flares observed during the solar cycle 23 and solar cycle 24, which consist of the period of year 1997 to year 2015. A total number of 505 types-II radio bursts were observed during the above period out of which only 20 types II radio bursts have frequencies ≤ 1 MHz. The time duration of 20 LF type II bursts ranges from 5 min to 2020 min. On investigation of 17 type-II bursts associated CMEs, solar flares, and coronal holes we also found that 12 types-II burst related CMEs observed when there were CHs and solar flares within 10° and 5 type-II burst-associated CMEs found when there were CHs and solar flares within 30°, respectively. In this paper we have done statistical analysis of low frequency type II radio bursts and related solar phenomena. The LF type-II radio bursts start after the peak time of associated solar flares. In this paper each LF type-II radio burst and other related solar phenomena are seen and analyzed to understand the origin of LF type-II radio bursts from the Sun in the latest scenario of solar heliophysics.