A positional comparison between coronal mass ejection events and solar type II bursts

Solar Physics ◽  
1985 ◽  
Vol 97 (1) ◽  
pp. 145-157 ◽  
Author(s):  
R. D. Robinson ◽  
R. T. Stewart
Keyword(s):  
Coronal Mass Ejection ◽  
Type Ii ◽  
Solar Type ◽  
Type Ii Bursts ◽  
Mass Ejection

scholarly journals Flare- and coronal mass ejection (CME)-associated type II bursts and related radio emissions

2000 ◽  
Vol 105 (A8) ◽  
pp. 18225-18234 ◽  
Author(s):  
Yolande Leblanc ◽  
George A. Dulk ◽  
Angelos Vourlidas ◽  
Jean-Louis Bougeret
Keyword(s):  
Coronal Mass Ejection ◽  
Type Ii ◽  
Radio Emissions ◽  
Type Ii Bursts ◽  
Mass Ejection

scholarly journals A SOLAR TYPE II RADIO BURST FROM CORONAL MASS EJECTION-CORONAL RAY INTERACTION: SIMULTANEOUS RADIO AND EXTREME ULTRAVIOLET IMAGING

2014 ◽  
Vol 787 (1) ◽  
pp. 59 ◽  
Author(s):  
Yao Chen ◽  
Guohui Du ◽  
Li Feng ◽  
Shiwei Feng ◽  
Xiangliang Kong ◽  
...  
Keyword(s):  
Coronal Mass Ejection ◽  
Radio Burst ◽  
Extreme Ultraviolet ◽  
Type Ii ◽  
Solar Type ◽  
Mass Ejection

Formation of Radio Type II Bursts During a Multiple Coronal Mass Ejection Event

Solar Physics ◽  
2017 ◽  
Vol 292 (12) ◽  
Author(s):  
Firas Al-Hamadani ◽  
Silja Pohjolainen ◽  
Eino Valtonen
Keyword(s):  
Coronal Mass Ejection ◽  
Type Ii ◽  
Type Ii Bursts ◽  
Mass Ejection ◽  
Ejection Event

Carrington Events

2021 ◽  
Vol 59 (1) ◽  
Author(s):  
Hugh S. Hudson
Keyword(s):  
Solar Flare ◽  
Coronal Mass Ejection ◽  
Cosmic Ray ◽  
Lessons Learned ◽  
Publication Date ◽  
The Sun ◽  
Theoretical Understanding ◽  
Solar Event ◽  
Solar Type ◽  
Mass Ejection

The Carrington event in 1859, a solar flare with an associated geomagnetic storm, has served as a prototype of possible superflare occurrence on the Sun. Recent geophysical (14C signatures in tree rings) and precise time-series photometry [the bolometric total solar irradiance (TSI) for the Sun, and the broadband photometry from Kepler and Transiting Exoplanet Survey Satellite, for the stars] have broadened our perspective on extreme events and the threats that they pose for Earth and for Earth-like exoplanets. This review assesses the mutual solar and/or stellar lessons learned and the status of our theoretical understanding of the new data, both stellar and solar, as they relate to the physics of the Carrington event. The discussion includes the event's implied coronal mass ejection, its potential “solar cosmic ray” production, and the observed geomagnetic disturbances based on the multimessenger information already available in that era. Taking the Carrington event as an exemplar of the most extreme solar event, and in the context of our rich modern knowledge of solar flare and/or coronal mass ejection events, we discuss the aspects of these processes that might be relevant to activity on solar-type stars, and in particular their superflares. ▪ The Carrington flare of 1859, though powerful, did not significantly exceed the magnitudes of the greatest events observed in the modern era. ▪ Stellar “superflare” events on solar-type stars may share common paradigms, and also suggest the possibility of a more extreme solar event at some time in the future. ▪ We benefit from comparing the better-known microphysics of solar flares and CMEs with the diversity of related stellar phenomena. Expected final online publication date for the Annual Review of Astronomy and Astrophysics, Volume 59 is September 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

scholarly journals Fragmented type II burst emission during CME liftoff

2008 ◽  
Vol 4 (S257) ◽  
pp. 357-359
Author(s):  
Silja Pohjolainen ◽  
Jens Pomoell ◽  
Rami Vainio
Keyword(s):  
Active Region ◽  
Dynamic Spectrum ◽  
Shock Acceleration ◽  
Type Ii ◽  
Know How ◽  
Loop Area ◽  
Mhd Simulations ◽  
Type Ii Bursts ◽  
Mass Ejection ◽  
Radio Event

AbstractWe have performed multiwavelength analysis on an event with a metric type II burst, which appeared first as fragmented emission lanes in the radio dynamic spectrum. The start frequency was unusually high. Since type II bursts are thought to be signatures of propagating shock waves, it is of interest to know how the shocks, and the type II bursts, are formed. This radio event was associated with a flare and a coronal mass ejection (CME), and we investigate their connection. Observations suggested that a propagating shock was formed due to the erupting structures, and the observed radio emission reflects the high densities in active region loops. We then utilised numerical MHD simulations, to study the shock structure induced by an erupting CME, in a model corona including dense loops. Our simulations show that the fragmented part of the type II burst can be formed when a coronal shock driven by a CME passes through a system of dense loops overlying an active region. To produce fragmented emission, the conditions for plasma emission have to be more favourable inside the loop than in the inter-loop area. The obvious hypothesis, consistent with our simulation model, is that the shock strength decreases significantly in the space between the denser loops. Outside the active region, the type II burst dies out when the changing geometry no longer favours the electron shock-acceleration.

Observations of Solar Type II bursts at frequencies 10–30 MHz

Solar Physics ◽  
2004 ◽  
Vol 222 (1) ◽  
pp. 151-166 ◽  
Author(s):  
V.N. Mel'nik ◽  
A.A. Konovalenko ◽  
H.O. Rucker ◽  
A.A. Stanislavsky ◽  
E.P. Abranin ◽  
...  
Keyword(s):  
Type Ii ◽  
Solar Type ◽  
Type Ii Bursts

A Unified Model of Coronal Mass Ejection–related Type II Radio Bursts

2000 ◽  
Vol 538 (2) ◽  
pp. L175-L178 ◽  
Author(s):  
Tetsuya Magara ◽  
Pengfei Chen ◽  
Kazunari Shibata ◽  
Takaaki Yokoyama
Keyword(s):  
Coronal Mass Ejection ◽  
Unified Model ◽  
Radio Bursts ◽  
Type Ii ◽  
Type Ii Radio Bursts ◽  
Mass Ejection

On the Possibility of Radio Emission from Quasi-parallel and Quasi-perpendicular Propagation of Shocks

2000 ◽  
Vol 179 ◽  
pp. 259-262
Author(s):  
A. Shanmugaraju ◽  
S. Umapathy
Keyword(s):  
Magnetic Field ◽  
Radio Emission ◽  
Radio Bursts ◽  
Type Ii ◽  
Simple Analysis ◽  
Type Ii Radio Bursts ◽  
Solar Type ◽  
Type Ii Bursts

AbstractA set of 21 solar type II radio bursts observed using Hiraiso radio spectrograph have been analysed to study the direction of propagation of coronal shocks. A simple analysis is carried out to find the approximate angle between the shock normal and magnetic field by solving the Rankine-Hugoniot MHD relation with assumption of Alfven speed and plasma beta. From this analysis, it is suggested that both quasi-parallel shocks (favourable) and quasi-perpendicular shocks can generate type II bursts depending upon the circumstances of the corona.

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