FEATURES OF THE INITIAL STAGE OF FORMATION OF FAST CORONAL MASS EJECTION ON FEBRUARY 25, 2014
Journal Title: Solar-Terrestrial Physics - Year 2020, Vol 6, Issue 3
Abstract
We have analyzed the fast coronal mass ejection (CME) that occurred on February 25, 2014. The analysis is based on images taken in the 131, 211, 304, and 1700 Å UV channels of the SDO/AIA instrument and from observations obtained in the Hα line (6562.8 Å) with the telescopes of the Teide and Big Bear Observatories. The February 25, 2014 CME is associated with the ejection and subsequent explosive expansion of the magnetic flux rope, which appeared near the solar surface presumably due to the tether-cutting magnetic reconnection. The impulse of full pressure (thermal plus magnetic) resulting from such an “explosion” acts on the overlying coronal arcades, causing them to merge and form an accelerated moving frontal structure of the CME. This pressure impulse also generates a blast collisional shock wave ahead of the CME, whose velocity decreases rapidly with distance. At large distances R>7R₀ (R₀ is the solar radius) from the center of the Sun in front of the CME, a shock wave of another type is formed — a “piston” collisional shock wave whose velocity varies little with distance. At R≥15R₀, there is a transition from a collisional to a collisionless shock wave.
Authors and Affiliations
Eselevich V. G. , Eselevich M. V.
Keywords
Related Articles
- EP ID EP700067
- DOI 10.12737/stp-63202001
- Views 106
- Downloads 0
SHAPE OF SPECTRUM OF GALACTIC COSMIC RAY INTENSITY FLUCTUATIONS
The impact of solar wind plasma on fluxes of galactic cosmic rays (CR) penetrating from the outside into the heliosphere with energies above ~1 GeV leads to temporal variations in the CR intensity in a wide frequency ran...
Monitoring observations of meteor echo at the EKB ISTP SB RAS radar: algorithms, validation, statistics
The paper considers the implementation of algorithms for automatic search for signals scattered by meteor trails according to EKB ISTP SB RAS radar data. In general, the algorithm is similar to the algorithms adopted in...
NUMERICAL ANALYSIS OF THE SPATIAL STRUCTURE OF ALFVÉN WAVES IN A FINITE PRESSURE PLASMA IN A DIPOLE MAGNETOSPHERE
We have carried out a numerical analysis of the spatial structure of Alfvén waves in a finite pressure inhomogeneous plasma in a dipole model of the magnetosphere. We have considered three magnetosphere models differing...
SOLAR SPECTROPOLARIMETER FOR SPACE WEATHER FORECAST
We propose a project of the meter wavelength range solar spectropolarimeter designed for a ground-based network developing for space weather forecast. The Software-Defined Radio (SDR) solution is chosen to meet such inst...
FORCE BALANCE IN CURRENT SHEETS IN COLLISIONLESS PLASMA
In this paper, we derive a divergent form of the force balance equation for collisionless plasma in the quasineutrality approximation, in which the electric field and current density are excluded. For a stationary spatia...