Space Storms

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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.

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.

Sun-Earth System Response to Extreme Solar and Seismic Events

1 February 2014
N. Balan
The special section is intended to consolidate the interesting good papers out of over 40 papers to be presented in a session on the same title in the AOGS-AGU(WPGM) joint assembly to be held in Singapore during 13- 17 August 2012; papers from outside the assembly session will also be considered. The special section will cover the response of the coupled Sun-Earth system to extreme seismic events thermospheric and ionospheric stormsBalan power supply systems and Earth's climate. The recent long deep solar minimum provided the opportunity to study the intrinsic behavior of the upper atmosphere-ionosphere system and its coupling to the regions below with minimum forcing from regions above.|

The November 1993 Geomagnetic Storm

1 November 1998
As the international space physics community marks the 40th anniversary of the International Geophysical Year and anticipates the rising geomagnetic activity of solar cycle 23, it is important to gauge the progress in understanding solar terrestrial disturbances and their capacity to disrupt human endeavor.

Energy Transfer During Magnetospheric Substorms, Papers From CDAW 6

1 February 1985
The GOES 2 and GOES 3 satellite high resolution magnetometer data are examined for the March 22, 1979, substorm interval selected by the Coordinated Data Analysis Workshop 6 analysis. Both GOES satellites were on the geographic equator with GOES 2 at 104° west geographic longitude and GOES 3 at 135° west geographic longitude.

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.

Initial Results: IMS Workshop (CDAW 2) on the July 29, 1977 Magnetic Storm

1 August 1982
We review the physical characteristics and temporal development of a significant IMS magnetospheric event: the sudden commencement and multiple substorms of July 29, 1977. An interplanetary shock, superimposed on relatively high solar wind densities, forced the magnetopause at 0027 UT in past the position of GEOS 1 (ˆÂ¼6.7 RE).

Response of Geospace to High-Speed Streams

1 September 2012
M. Liemohn

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.

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.