Heights of Coronal Mass Ejections and Shocks Inferred from Metric and DH Type II Radio Bursts

Shanmugaraju, A.; Lawrance, M. Bendict; Moon, Yong‐Jae; Lee, Jae‐Ok; Suresh, K. A.

doi:10.1007/s11207-017-1155-7

Cited by 8 publications

(5 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, one type II event with a shock formation height greater than 3 Rs was observed. This can be explained that the shock might have been sparked at flanks or experienced flare-blast waves (see Shanmugaraju et al, 2017). Gopalswamy et al, (2013), who analyzed 32 metric type II bursts and found that the mean and median starting frequencies are 102 MHz and 85 MHz, respectively.…”

Section: Statistical Resultsmentioning

confidence: 99%

“…Some other studies (see Cho et al, 2013) pointed out that CME-driven shocks can explain the source of type II radio bursts in the lower corona. It is widely recognized that type II radio bursts in the metric and deca-hectometric wavelengths associated with CMEs/ interplanetary coronal mass ejections (ICMEs) can be deployed as substitutes to examine the near-Sun kinematics and dynamics of CMEs and can serve as an indicator for geomagnetic storms (Mujiber et al, 2012;Vasanth and Umapathy, 2013;Shanmugaraju et al, 2017;Umuhire et al, 2021b).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Assessing the spectral characteristics of band splitting type II radio bursts observed by CALLISTO spectrometers

Minta

Nozawa

Kozarev

et al. 2023

Advances in Space Research

View full text Add to dashboard Cite

Section: Statistical Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Assessing the spectral characteristics of band splitting type II radio bursts observed by CALLISTO spectrometers

Minta

Nozawa

Kozarev

et al. 2023

Advances in Space Research

View full text Add to dashboard Cite

“…Type II bursts can sometimes occur without any CME, and are then associated with flares (Magdalenić et al, 2012;Su et al, 2015). Meter-wavelength type II bursts associated with CMEs can be used as a proxy to estimate the near-Sun kinematics and dynamics of a CME (Shanmugaraju et al, 2017;Kumari et al, 2017a,b). Type II bursts can also be observed in the decameter/hectometer (DH) frequency range (≤ 15 MHz).…”

Section: Introductionmentioning

confidence: 99%

Trends and characteristics of high-frequency type II bursts detected by CALLISTO spectrometers

Umuhire

Uwamahoro

Raja

et al. 2021

Advances in Space Research

View full text Add to dashboard Cite

“…The coronal electron density is a major factor in determining the type II emission frequency, and any variations in coronal density along the shock path will have a better ambient for producing type II radio emission. Since CME and shock interact with streamer, it is widely recognized that this region is an important source for type II bursts (Sheeley, Hakala, and Wang, 2000;Cho et al, 2008Cho et al, , 2011Chen et al, 2010;Feng et al, 2011;Shanmugaraju et al, 2017).…”

Section: Interaction Of Rq/rl Cmes With Streamers and Pre-cmesmentioning

confidence: 99%

Comparison Between Radio Loud and Radio Quiet Fast CMEs: A Reason for Radio Quietness

2023

Self Cite

View full text Add to dashboard Cite

It is well known that fast CMEs are mostly associated with MHD shocks in the solar corona, leading to the formation of type II radio bursts. However, the absence of type II radio burst is not uncommon. Herein, we aim to analyze the differences between the radio loud (RL) and radio quiet (RQ) fast Coronal Mass Ejections (CMEs) (speed ≥ 900 km s −1 ) during solar cycle 24 (2008-2021). Among the selected 309 CMEs, we identified the associated flares for 143 events using running difference images from (i) Solar Dynamic Observatory/Atmospheric Imaging Assembly (SDO/AIA) observations and (ii) Large Angle Spectrometric Coronagraph (LASCO). Among these 143 events, RQ and RL groups have 70 and 73 events, respectively. CALLISTO and Wind/WAVES observations are used to identify these RL and RQ sets. We analyzed the possibilities of streamer-CME and CME-CME interaction. In this study, we report the important differences between RL and RQ CMEs and the underlying reasons for the radio quietness of fast CMEs. In the LASCO field of view, the majority of RL CMEs (almost 90%) interacted with streamers and/or pre-CMEs, whereas only 25% of RQ CMEs did the same, and there was no pre-CME interaction. The observational evidence led to the conclusion that substantial density perturbation/interaction increases the probability of production of type II radio emissions by shock of RL CMEs.

show abstract

Heights of Coronal Mass Ejections and Shocks Inferred from Metric and DH Type II Radio Bursts

Cited by 8 publications

References 48 publications

Assessing the spectral characteristics of band splitting type II radio bursts observed by CALLISTO spectrometers

Assessing the spectral characteristics of band splitting type II radio bursts observed by CALLISTO spectrometers

Trends and characteristics of high-frequency type II bursts detected by CALLISTO spectrometers

Comparison Between Radio Loud and Radio Quiet Fast CMEs: A Reason for Radio Quietness

Contact Info

Product

Resources

About