Space Storms

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Substorm Perspectives With Modern Magnetospheric and Ground Observatories

1 October 2011
L. Lyons
Magnetic activity in the Northern Hemisphere auroral region was examined during solar cycles 22 and 23 (1993“2008). Substorms were identified from ground-based magnetic field measurements by an automated search engine.

Space Weather Modeling: Status and Prospects

1 May 2008
This special section results primarily from the CAWSES International Workshop on Space Weather Modeling (CSWM), which was held on 14“17 November 2006 in Yokohama, Japan, but includes several papers that were not presented at the Workshop

Response of Geospace to High-Speed Streams

1 September 2012
M. Liemohn

Solar Coronal Mass Ejections and Energetic Particles

1 October 2006
This special section on Solar Coronal Mass Ejections and Energetic Particles in the Journal of Geophysical Research- Space Physics contains a selection of papers presented at the Chapman Conference on Solar Energetic Plasmas and Particles that was held at the University of Turku, Finland, during 2“6 August 2004. The conference sessions concentrated on the solar origins of solar energetic particles (SEPs) from flares and coronal mass ejections (CMEs) and on their properties in relation to these solar eruptions.

Storm Time Plasma Redistribution: Causes and Consequences

1 May 2011
T. E. Moore
Outflows of ionospheric ions contributors to the Fall 2009 AGU special session SM05: System Effects of Ionospheric-Magnetospheric Plasma Redistribution During StormsMoore September 2009.

Space Weather

1 December 2001
This special section provides a collection of results from the frontier of space weather research. The striking characteristics of the research contained herein are the broadness of the space region and the richness in method and approach.

Tracing the Sun-Earth Connection: April 2002 Events

1 April 2006
Tracing the Sun-Earth Connection: April 2002 Events

Large Geomagnetic Storms

1 March 2009
N. Gopalswamy
Papers constituting this special section fall into three groups addressing solar“interplanetary phenomena, magnetospheric phenomena, and ionospheric phenomena related to cycle 23 storms with a single exception dealing with an important storm from cycle 22.

Big storms of the Van Allen Probes era

The overarching goal of the Van Allen Probes mission is to understand dynamic variability of the radiation belts and ring current in response to varying solar wind driving. Over the last three years the Probes have collected comprehensive field and particle measurements over the inner magnetosphere during more than 50 geomagnetic storms, including the two biggest storms of the decade on March 17, 2015 (Dst=-225 nT) and June 23, 2015 (Dst=-195) characterized by dramatic variability of the energetic particle environment.

This collection documents new understanding of radiation belts and ring current processes built on the synergy of multi-point measurements. These papers combine data from multiple ongoing constellation missions, ground-based observatories, and state-of-the-art models to develop system-wide understanding of the inner magnetosphere during large geomagnetic storms of the Van Allen Probes mission.

Geospace system responses to the St. Patrick's Day storms in 2013 and 2015

Geospace responses to solar and interplanetary disturbance induced geomagnetic storms via changes in electromagnetic fields, particle precipitation, plasma and neutral dynamics and energetics, are the fundamental components of space weather. Though major processes through which the coupled magnetosphere, ionosphere, thermosphere and mesosphere  (MITM) system responses to storms are generally known, a number of significant aspects of these responses remain challenging. These include quantitative understanding of the processes, the feedback and nonlinear interaction effects within the MITM system, and the vast variability in the system responses themselves. Geomagnetic storms around 17-19 March in 2013 and 2015 (the St. Patrick’s Day intervals) provided a fresh opportunity to address these challenges while testing our current understanding of the storm-time MITM behavior with improved global observations and new modeling capability. In particular, comparative studies between these two storms are of great interest since they occurred at the same dates (season) but were of different intensities. Comparisons with other storms with similar upstream drivers are also valuable to fully understand the MITM system response to storms under different geophysical conditions.