J. Space Weather Space Clim.
Volume 4, 2014
|Number of page(s)||8|
|Published online||07 January 2014|
The interplanetary causes of geomagnetic activity during the 7–17 March 2012 interval: a CAWSES II overview
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA
2 The Brazilian Institute for Space Research (INPE), Sao Jose dos Campos, SP 12227-010, Brazil
3 Kwasan Observatory, Kyoto University, 607-8471, Japan
4 Center for Space and Aeronomy Research, University of Alabama, Huntsville, AL 35805, USA
5 University of Michigan, Ann Arbor, MI 48109-2143, USA
6 Department of Planetary Research, The Rhein Institute for the Environment, University of Cologne, 50931 Köln, Germany
* Corresponding author: firstname.lastname@example.org
Accepted: 11 December 2013
This overview paper presents/discusses the major solar, interplanetary, magnetospheric, and ionospheric features of the CAWSES II interval of study: 7–17 March 2012. Magnetic storms occurred on 7, 9, 12, and 15 March with peak SYM-H intensities of −98 nT, −148 nT, −75 nT (pressure corrected), and −79 nT, respectively. These are called the S1, S2, S3, and S4 events. Although three of the storm main phases (S1, S3, and S4) were caused by IMF Bsouth sheath fields and the S2 event was associated with a magnetic cloud (MC), the detailed scenario for all four storms were different. Two interplanetary features with unusually high temperatures and intense and quiet magnetic fields were identified located antisunward of the MCs (S2 and S3). These features are signatures of either coronal loops or coronal sheaths. A high speed stream (HSS) followed the S4 event where the presumably southward IMF Bz components of the Alfvén waves extended the storm “recovery phase” by several days. The ICME-associated shocks were particularly intense. The fast forward shock for the S2 event had a magnetosonic Mach number of ~9.4, the largest in recorded history. All of the shocks associated with the ICMEs created sudden impulses (SI+s) at Earth. The shocks preceding the S2 and S3 magnetic storms caused unusually high SI+ intensities of ~60 and 68 nT, respectively. Many further studies on various facets of this active interval are suggested for CAWSES II researchers and other interested parties.
Key words: storm / interplanetary coronal mass ejection / shocks / ionosphere (equatorial) / solar wind
© B.T. Tsurutani et al., Published by EDP Sciences 2014
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.