Results 21 to 30 of about 237 (168)

A Simulation of a Coronal Mass Ejection Propagation and Shock Evolution in the Lower Solar Corona

The Astrophysical Journal, 2008
We present a detailed simulation of the evolution of a moderately slow coronal mass ejection (CME; 800 km s−1 at 5 R☉, where R☉ is solar radii) in the lower solar corona (2-5 R☉). The configuration of the Sun's magnetic field is based on the MDI data for the solar surface during Carrington rotation 1922.
Y. C.‐M. Liu, M. Opher, O. Cohen, P. C. Liewer, T. I. Gombosi   +4 more
openaire   +1 more source

MAGNETIC FIELD STRENGTH IN THE UPPER SOLAR CORONA USING WHITE-LIGHT SHOCK STRUCTURES SURROUNDING CORONAL MASS EJECTIONS [PDF]

The Astrophysical Journal, 2012
To measure the magnetic field strength in the solar corona, we examined 10 fast (> 1000 km/s) limb CMEs which show clear shock structures in SOHO/LASCO images. By applying piston-shock relationship to the observed CME's standoff distance and electron density compression ratio, we estimated the Mach number, Alfven speed, and magnetic field strength ...
Kim, R. -S., Gopalswamy, N., Moon, Y. -J., Cho, K. -S., Yashiro, S.   +4 more
openaire   +2 more sources

Height of shock formation in the solar corona inferred from observations of type II radio bursts and coronal mass ejections [PDF]

Advances in Space Research, 2013
14 pages, 4 figures, 2 tables, COSPAR ...
N. Gopalswamy, H. Xie, P. Mäkelä, S. Yashiro, S. Akiyama, W. Uddin, A.K. Srivastava, N.C. Joshi, R. Chandra, P.K. Manoharan, K. Mahalakshmi, V.C. Dwivedi, R. Jain, A.K. Awasthi, N.V. Nitta, M.J. Aschwanden, D.P. Choudhary   +16 more
openaire   +2 more sources

ARE THE FAINT STRUCTURES AHEAD OF SOLAR CORONAL MASS EJECTIONS REAL SIGNATURES OF DRIVEN SHOCKS?

The Astrophysical Journal, 2014
Recently, several studies have assumed that the faint structures ahead of coronal mass ejections (CMEs) are caused by CME-driven shocks. In this study, we have conducted a statistical investigation to determine whether or not the appearance of such faint structures depends on CME speeds.
Jae-Ok Lee, Y.-J. Moon, Jin-Yi Lee, Kyoung-Sun Lee, Sujin Kim, Kangjin Lee   +5 more
openaire   +1 more source

Comparison of the coronal mass ejection shock acceleration of three widespread SEP events during solar cycle 24 [PDF]

Journal of Geophysical Research: Space Physics, 2017
AbstractWe studied three solar energetic particle (SEP) events observed on 14 August 2010, 3 November 2011, and 5 March 2013 by Solar Terrestrial Relations Observatory (STEREO) A, B, and near‐Earth (L1) spacecraft with a longitudinal distribution of particles >90°.
H. Xie, P. Mäkelä, O. C. St. Cyr, N. Gopalswamy   +3 more
openaire   +1 more source

Comment on “Non-interacting coronal mass ejections and solar energetic particles near the quadrature configuration of solar terrestrial relations observatory”: CME shocks are fast magnetosonic shocks and not intermediate Alfvén shocks

Astronomy & Astrophysics, 2021
Aims.The expression for the shock Mach number used by Ravishankar and Michalek (2020, A&A, 638, A42) is incorrect. We wish to provide a correct expression so they can redo their analyses.Methods.Coronal mass ejection (CME) shocks are fast magnetosonic shocks and not intermediate Alfvén shocks.
Tsurutani, B. T., Shan, L., Lakhina, G. S., Mazelle, C., Meng, X., Du, A., Liu, Z.   +6 more
openaire   +2 more sources

Radial distributions of magnetic field strength in the solar corona as derived from data on fast halo CMEs

Solar-Terrestrial Physics, 2018
In recent years, information about the distance between the body of rapid coronal mass ejection (CME) and the associated shock wave has been used to measure the magnetic field in the solar corona.
Fainshtein V.G., Egorov Ya.I.
doaj   +1 more source

Simulated enhancement of solar type II radio bursts during the collision of two shocks associated with coronal mass ejections [PDF]

Astronomy & Astrophysics, 2006
Aims. We investigate how solar type II radio bursts can be enhanced when two fast magnetosonic shocks associated with coronal mass ejections (CMEs) collide. This work was motivated by recent observations showing that the radio signature is in the form of intense continuum-like radio emission following an interplanetary type II burst, when a fast CME ...
J. I. Sakai, T. Mori, S. Saito, Y. Tanaka, H. Aurass   +4 more
openaire   +1 more source

Near-Sun In Situ and Remote-sensing Observations of a Coronal Mass Ejection and its Effect on the Heliospheric Current Sheet

The Astrophysical Journal, 2023
During the thirteenth encounter of the Parker Solar Probe (PSP) mission, the spacecraft traveled through a topologically complex interplanetary coronal mass ejection (ICME) beginning on 2022 September 5.
O. M. Romeo, C. R. Braga, S. T. Badman, D. E. Larson, M. L. Stevens, J. Huang, T. Phan, A. Rahmati, R. Livi, S. T. Alnussirat, P. L. Whittlesey, A. Szabo, K. G. Klein, T. Niembro-Hernandez, K. Paulson, J. L. Verniero, D. Lario, N. E. Raouafi, T. Ervin, J. Kasper, M. Pulupa, S. D. Bale, M. G. Linton   +22 more
doaj   +1 more source

Multispacecraft Remote Sensing and In Situ Observations of the 2020 November 29 Coronal Mass Ejection and Associated Shock: From Solar Source to Heliospheric Impacts

The Astrophysical Journal, 2022
Abstract We investigate the source eruption, propagation and expansion characteristics, and heliospheric impacts of the 2020 November 29 coronal mass ejection (CME) and associated shock, using remote sensing and in situ observations from multiple spacecraft.
Chong Chen, Ying D. Liu, Bei Zhu
openaire   +2 more sources