scholarly journals Statistical study of the alteration of the magnetic structure of magnetic clouds in the Earth's magnetosheath

2017 ◽  
Vol 122 (3) ◽  
pp. 2956-2972 ◽  
Author(s):  
L. Turc ◽  
D. Fontaine ◽  
C. P. Escoubet ◽  
E. K. J. Kilpua ◽  
A. P. Dimmock
Keyword(s):  
Magnetic Structure ◽  
Statistical Study ◽  
Magnetic Clouds

scholarly journals Concurrent effect of Alfvén waves and planar magnetic structure on geomagnetic storms

2019 ◽  
Vol 490 (3) ◽  
pp. 3440-3447 ◽  
Author(s):  
Zubair I Shaikh ◽  
Anil Raghav ◽  
Geeta Vichare ◽  
Ankush Bhaskar ◽  
Wageesh Mishra ◽  
...  
Keyword(s):  
Magnetic Structure ◽  
Geomagnetic Storms ◽  
Recovery Phase ◽  
Alfven Waves ◽  
Magnetic Clouds ◽  
Alfvén Waves ◽  
Fast Recovery ◽  
Interplanetary Coronal Mass Ejection ◽  
Mass Ejection

ABSTRACT Generally, interplanetary coronal mass ejection (ICME) triggers intense and strong geomagnetic storms. It has been established that the ICME sheath-moulded planar magnetic structure enhances the amplitude of the storms. Alfvén waves embedded in ICME magnetic clouds or high solar streams including corotating interacting regions (CIRs) in turn extend the recovery phase of the storm. Here, we investigate a geomagnetic storm with a very complex temporal profile with multiple decreasing and recovery phases. We examine the role of planar magnetic structure (PMS) and Alfvén waves in the various phases of the storm. We find that fast decrease and fast recovery phases are evident during transit of PMS regions, whereas a slight decrease or recovery is found during the transit of regions embedded with Alfvénic fluctuations.

scholarly journals A statistical study of interplanetary shocks and pressure pulses internal to magnetic clouds

2007 ◽  
Vol 112 (A6) ◽  
pp. n/a-n/a ◽  
Author(s):  
Michael R. Collier ◽  
Ronald P. Lepping ◽  
Daniel B. Berdichevsky
Keyword(s):  
Statistical Study ◽  
Magnetic Clouds ◽  
Interplanetary Shocks ◽  
Pressure Pulses

Fitting of expanding magnetic clouds: A statistical study

2009 ◽  
Vol 57 (12) ◽  
pp. 1375-1380 ◽  
Author(s):  
A. Lynnyk ◽  
M. Vandas
Keyword(s):  
Statistical Study ◽  
Magnetic Clouds

Magnetic clouds: A statistical study of magnetic helicity

2005 ◽  
Vol 67 (17-18) ◽  
pp. 1761-1766 ◽  
Author(s):  
A.M. Gulisano ◽  
S. Dasso ◽  
C.H. Mandrini ◽  
P. Démoulin
Keyword(s):  
Statistical Study ◽  
Magnetic Clouds ◽  
Magnetic Helicity

scholarly journals A STATISTICAL STUDY OF THE AVERAGE IRON CHARGE STATE DISTRIBUTIONS INSIDE MAGNETIC CLOUDS FOR SOLAR CYCLE 23

2016 ◽  
Vol 224 (2) ◽  
pp. 27 ◽  
Author(s):  
H. Q. Song ◽  
Z. Zhong ◽  
Y. Chen ◽  
J. Zhang ◽  
X. Cheng ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Charge State ◽  
Statistical Study ◽  
Magnetic Clouds ◽  
Solar Cycle 23 ◽  
Charge State Distributions

scholarly journals Correction to “A statistical study of interplanetary shocks and pressure pulses internal to magnetic clouds”

2007 ◽  
Vol 112 (A9) ◽  
pp. n/a-n/a
Author(s):  
Michael R. Collier ◽  
Ronald P. Lepping ◽  
Daniel B. Berdichevsky
Keyword(s):  
Statistical Study ◽  
Magnetic Clouds ◽  
Interplanetary Shocks ◽  
Pressure Pulses

scholarly journals Understanding the variability of magnetic storms caused by ICMEs

2017 ◽  
Vol 35 (1) ◽  
pp. 147-159 ◽  
Author(s):  
Remi Benacquista ◽  
Sandrine Rochel ◽  
Guy Rolland
Keyword(s):  
Solar Wind ◽  
Magnetic Structure ◽  
Large Scale ◽  
Temporal Dynamics ◽  
Magnetic Storms ◽  
Magnetic Clouds ◽  
Interplanetary Coronal Mass Ejections ◽  
Superposed Epoch Analysis ◽  
Original Insight ◽  
Ambient Solar Wind

Abstract. In this paper, we study the dynamics of magnetic storms due to interplanetary coronal mass ejections (ICMEs). We used multi-epoch superposed epoch analyses (SEAs) with a choice of epoch times based on the structure of the events. By sorting the events with respect to simple large-scale features (presence of a shock, magnetic structure, polarity of magnetic clouds), this method provides an original insight into understanding the variability of magnetic storm dynamics. Our results show the necessity of seeing ICMEs and their preceding sheaths as a whole since each substructure impacts the other and has an effect on its geoeffectiveness. It is shown that the presence of a shock drives the geoeffectiveness of the sheaths, while both the shock and the magnetic structure impact the geoeffectiveness of the ICMEs. In addition, we showed that the ambient solar wind characteristics are not the same for ejecta and magnetic clouds (MCs). The ambient solar wind upstream magnetic clouds are quieter than upstream ejecta and particularly slower. We also focused on the polarity of magnetic clouds since it drives not only their geoeffectiveness but also their temporal dynamics. South–north magnetic clouds (SN-MCs) and north–south magnetic clouds (NS-MCs) show no difference in geoeffectiveness for our sample of events. Lastly, since it is well-known that sequences of events can possibly induce strong magnetic storms, such sequences have been studied using superposed epoch analysis (SEA) for the first time. We found that these sequences of ICMEs are very usual and concern about 40 % of the ICMEs. Furthermore, they cause much more intense magnetic storms than isolated events do.

scholarly journals A statistical study on solar soft X-ray flare and the sources

2012 ◽  
Vol 8 (S294) ◽  
pp. 551-552
Author(s):  
Juan Guo
Keyword(s):  
Magnetic Structure ◽  
Data Center ◽  
Sunspot Group ◽  
Statistical Study ◽  
Geophysical Data ◽  
X Ray ◽  
National Geophysical Data ◽  
National Geophysical Data Center ◽  
Class Flare ◽  
Sunspot Groups

AbstractWe surveyed 28 year of Solar X-ray flares and sunspot group records supplied by the National Geophysical Data Center (NGDC) to study the dependence of different class Xray flares on the magnetic structure of sunspot groups statistically. It is found that 82.5% X-class flare, 51.4% M-class flare, 26.3% C-class flare, and 10.1% B-class flare occurred in the sunspot group with βγδ structure. There are 6.6% X-class flares, 17.5% M-class flare, 39.1% C-class flare, and 60.4% B-class flare occurred out of sunspot group.

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