scholarly journals Velocities of Shock Fronts in Solar Corona Generating Type II Radio Bursts at Metre Wavelengths

1962 ◽  
Vol 15 (1) ◽  
pp. 120
Author(s):  
M Krishnamurthi ◽  
G Sivarama Sastry ◽  
T Seshagiri Rao
Keyword(s):  
Shock Front ◽  
Solar Corona ◽  
Solar Flares ◽  
Radio Bursts ◽  
Type Ii ◽  
Plasma Oscillations ◽  
Slow Drift ◽  
Type Ii Radio Bursts ◽  
Shock Fronts ◽  
Comprehensive Study

At the time of intense solar flares, various types of enhanced radio emission from the Sun have been observed. Using such techniques as the swept frequency technique first developed by Wild and his associates, these enhanced emissions have been classified into five types. Of particular interest to radio astronomy at metre wavelengths is the slow drift type II bursts. A comprehensive study of these bursts has been made by Roberts (1959). It is now supposed that at the start of a flare an explosion occurs in the lower regions of the solar atmosphere ejecting a column of gas which travels radially outward from the region of the flare. This column of gas is bounded by a shock front which moves forward relative to this gas. This shock front is assumed to excite plasma oscillations in the solar corona giving rise to type II radiation. Velocities of these shock fronts have been determined by various workers.

scholarly journals Height of shock formation in the solar corona inferred from observations of type II radio bursts and coronal mass ejections

2013 ◽  
Vol 51 (11) ◽  
pp. 1981-1989 ◽  
Author(s):  
N. Gopalswamy ◽  
H. Xie ◽  
P. Mäkelä ◽  
S. Yashiro ◽  
S. Akiyama ◽  
...  
Keyword(s):  
Solar Corona ◽  
Coronal Mass Ejections ◽  
Shock Formation ◽  
Radio Bursts ◽  
Type Ii ◽  
Type Ii Radio Bursts

scholarly journals Radio Data and Computer Simulations for Shock Waves Generated by Solar Flares

1980 ◽  
Vol 91 ◽  
pp. 251-255
Author(s):  
Alan Maxwell ◽  
Murray Dryer
Keyword(s):  
Shock Waves ◽  
Solar Corona ◽  
Computer Simulations ◽  
Solar Flares ◽  
Solar Radio ◽  
Radio Bursts ◽  
Type Ii ◽  
Fast Mode ◽  
Solar Radio Bursts ◽  
Radio Data

Solar radio bursts of spectral type II provide a prime diagnostic for the passage of shock waves, generated by solar flares, through the solar corona. In this investigation we have compared radio data on the shocks with computer simulations for the propagation of fast-mode MHD shocks through the solar corona. The radio data were recorded at the Harvard Radio Astronomy Station, Fort Davis, Texas. The computer simulations were carried out at NOAA, Boulder, Colorado.

scholarly journals Electron Acceleration at Quasi-Parallel Shocks in The Solar Corona and Its Signature in Solar Type II Radio Bursts

1994 ◽  
Vol 142 ◽  
pp. 577-581
Author(s):  
G. Mann ◽  
H. Lühr
Keyword(s):  
Magnetic Field ◽  
Solar Corona ◽  
Radio Bursts ◽  
Type Ii ◽  
Radio Radiation ◽  
Earth’S Bow Shock ◽  
Type Ii Radio Bursts ◽  
Solar Type ◽  
Field Geometry ◽  
The Magnetic Field

AbstractRecently, strong large amplitude magnetic field structures (SLAMS) have been observed as a common phenomenon in the vicinity of the quasi-parallel region of Earth’s bow shock. A quasi-parallel shock transition can be considered as a patchwork of SLAMS. Using the data of the AMPTE/IRM magnetometer the properties of SLAMS are studied. Within SLAMS the magnetic field is strongly deformed and, thus, the magnetic field geometry is locally swung into a quasi-perpendicular regime. Therefore, electrons can locally be accelerated to high energies within SLAMS. Assuming that SLAMS also exist in the vicinity of supercritical, quasi-parallel shocks in the solar corona, they are able to generate radio radiation via the enhanced Langmuir turbulence excited by the accelerated electrons. Since SLAMS are connected with strong density enhancements, the aforementioned mechanism can explain the multiple-lane structure often occurred in solar Type II radio bursts.Subject headings: acceleration of particles — Earth — shock waves — Sun: corona — Sun: radio radiation

Solar flares associated coronal mass ejections in case of type II radio bursts

2016 ◽  
Vol 361 (8) ◽  
Author(s):  
Beena Bhatt ◽  
Lalan Prasad ◽  
Harish Chandra ◽  
Suman Garia
Keyword(s):  
Coronal Mass Ejections ◽  
Solar Flares ◽  
Radio Bursts ◽  
Type Ii ◽  
Type Ii Radio Bursts

Slow-drift (Type II) Radio Bursts from the Sun.

1960 ◽  
Vol 65 ◽  
pp. 502
Author(s):  
A. R. Thompson ◽  
A. Maxwell
Keyword(s):  
The Sun ◽  
Radio Bursts ◽  
Type Ii ◽  
Slow Drift ◽  
Type Ii Radio Bursts
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