scholarly journals Characteristics of Magnetic Clouds and Interplanetary Coronal Mass Ejections which Cause Intense Geomagnetic Storms

2013 ◽  
Vol 24 (2) ◽  
pp. 233 ◽  
Author(s):  
Chin-Chun Wu ◽  
Natchimuthuk Gopalswamy ◽  
Ronld Paul Lepping ◽  
Seiji Yashiro
Keyword(s):  
Coronal Mass Ejections ◽  
Geomagnetic Storms ◽  
Magnetic Clouds ◽  
Interplanetary Coronal Mass Ejections

scholarly journals On the relationship between interplanetary coronal mass ejections and magnetic clouds

2013 ◽  
Vol 31 (7) ◽  
pp. 1251-1265 ◽  
Author(s):  
E. K. J. Kilpua ◽  
A. Isavnin ◽  
A. Vourlidas ◽  
H. E. J. Koskinen ◽  
L. Rodriguez
Keyword(s):  
Solar Wind ◽  
Coronal Mass Ejections ◽  
Flux Rope ◽  
Leading Edge ◽  
Magnetic Clouds ◽  
Interplanetary Coronal Mass Ejections ◽  
Magnetic Flux Ropes ◽  
Geometrical Effect ◽  
Relationship Of ◽  
The Relationship

Abstract. The relationship of magnetic clouds (MCs) to interplanetary coronal mass ejections (ICMEs) is still an open issue in space research. The view that all ICMEs would originate as magnetic flux ropes has received increasing attention, although near the orbit of the Earth only about one-third of ICMEs show clear MC signatures and often the MC occupies only a portion of the more extended region showing ICME signatures. In this work we analyze 79 events between 1996 and 2009 reported in existing ICME/MC catalogs (Wind magnetic cloud list and the Richardson and Cane ICME list) using near-Earth observations by ACE (Advanced Composition Explorer) and Wind. We perform a systematic comparison of cases where ICME and MC signatures coincided and where ICME signatures extended significantly beyond the MC boundaries. We find clear differences in the characteristics of these two event types. In particular, the events where ICME signatures continued more than 6 h past the MC rear boundary had 2.7 times larger speed difference between the ICME's leading edge and the preceding solar wind, 1.4 times higher magnetic fields, 2.1 times larger widths and they experienced three times more often strong expansion than the events for which the rear boundaries coincided. The events with significant mismatch in MC and ICME boundary times were also embedded in a faster solar wind and the majority of them were observed close to the solar maximum. Our analysis shows that the sheath, the MC and the regions of ICME-related plasma in front and behind the MC have different magnetic field, plasma and charge state characteristics, thus suggesting that these regions separate already close to the Sun. Our study shows that the geometrical effect (the encounter through the CME leg and/or far from the flux rope center) does not contribute much to the observed mismatch in the MC and ICME boundary times.

MAGNETIC CLOUDS: A SUBJECT OF SPACE WEATHER PREDICTION

2005 ◽  
Vol 20 (29) ◽  
pp. 6650-6653
Author(s):  
A. GERANIOS ◽  
M. VANDAS ◽  
E. ANTONIADOU ◽  
O. ZACHAROPOULOU
Keyword(s):  
Space Weather ◽  
Coronal Mass Ejections ◽  
Strong Influence ◽  
Geomagnetic Storms ◽  
Interplanetary Medium ◽  
Weather Prediction ◽  
Magnetic Clouds ◽  
The Sun ◽  
Time Intervals ◽  
The Earth

Magnetic clouds are ideal objects for solar-terrestrial studies because of their simplicity and their extended time intervals of southward and northward magnetic fields. Magnetic clouds constitute a significant subset of coronal mass ejections with remarkable characteristics in the interplanetary medium and a strong influence on the Earth's magnetosphere, giving rise to geomagnetic storms. The evolution of such a cloud from the neighborhood of the Sun up to the Earth is numerically simulated for two cases, without and with a presence of a faster moving shock front. Its influence on the magnetosphere can be seen by the triggered geomagnetic storm. Therefore, magnetic clouds are an important subject for space weather predictions.

scholarly journals Evolution of interplanetary coronal mass ejections and magnetic clouds in the heliosphere

2013 ◽  
Vol 8 (S300) ◽  
pp. 245-254
Author(s):  
Pascal Démoulin
Keyword(s):  
Solar Wind ◽  
Physical Properties ◽  
Coronal Mass Ejections ◽  
Magnetic Measurements ◽  
Flux Rope ◽  
Magnetic Clouds ◽  
The Sun ◽  
Interplanetary Coronal Mass Ejections

AbstractInterplanetary Coronal Mass Ejections (ICMEs), and more specifically Magnetic Clouds (MCs), are detected with in situ plasma and magnetic measurements. They are the continuation of the CMEs observed with imagers closer to the Sun. A review of their properties is presented with a focus on their magnetic configuration and its evolution. Many recent observations, both in situ and with imagers, point to a key role of flux ropes, a conclusion which is also supported by present coronal eruptive models. Then, is a flux rope generically present in an ICME? How to quantify its 3D physical properties when it is detected locally as a MC? Is it a simple flux rope? How does it evolve in the solar wind? This paper reviews our present answers and limited understanding to these questions.

scholarly journals Energy transfer during intense geomagnetic storms driven by interplanetary coronal mass ejections and their sheath regions

2011 ◽  
Vol 116 (A5) ◽  
Author(s):  
Jianpeng Guo ◽  
Xueshang Feng ◽  
Barbara A. Emery ◽  
Jie Zhang ◽  
Changqing Xiang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Coronal Mass Ejections ◽  
Geomagnetic Storms ◽  
Interplanetary Coronal Mass Ejections
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