Table of Contents ====================================================================== 1. Call for Participation in Joint CEDAR-GEM Workshop: "High Speed Streams and Their Geospace-Atmosphere Consequences" 2. Call for Participation in Joint CEDAR-GEM Workshop: "Electrodynamic Coupling of the Ionosphere and Magnetosphere at Middle and Low Latitudes" ====================================================================== Note: All session announcements for the upcoming Joint CEDAR-GEM Workshop published in GEM Messenger can be found at: http://www-ssc.igpp.ucla.edu/gemwiki/index.php/2011_CEDAR-GEM_Joint_Workshop *************************** ** THE GEM MESSENGER ** *************************** Volume 21, Number 15 June 22, 2011 ---------------------------------------------------------------------- 1. Call for Participation in Joint CEDAR-GEM Workshop: "High Speed Streams and Their Geospace-Atmosphere Consequences" ---------------------------------------------------------------------- From: Janet Kozyra Joint CEDAR-GEM Workshop: High Speed Streams and Their Geospace- Atmosphere Consequences Date: 30 June 2011 Time: Session 1 1330-1530 UT Session 2 1600-1800 UT Conveners: Janet Kozyra Richard Thorne URL for Workshop: http://cedarweb.hao.ucar.edu/wiki/index.php/2011_Workshop:High_Speed_Stream_Driving_of_Geospace Invitation to Participate: Please come and participate in a multi-disciplinary discussion of the response of geospace and the atmosphere to high speed streams, both in general and as observed during the recent unusual solar minimum. All are welcome! * Speakers (listed below) have been invited to introduce new findings, the questions they raise, and possible consequences in other geospace regions. * We are very interested in information about additional features in geospace during high-speed streams. Please let the conveners know if you have 1-2 slides to present that raise new issues. * We are hoping to take advantage of the unique environment that the joint CEDAR-GEM meeting provides to identify the signatures of related processes in different regions. Please come and add your expertise to the mix in the joint workshop. Workshop Description: This workshop addresses the impacts of high speed streams on the development of auroral activity, radiation belt enhancements, inner magnetosphere-subauroral response, and atmospheric perturbations. A particular sub-focus is to explore the changes in the geospace- atmosphere response in the recent unusual solar minimum interval due to the combination of strong and long-lasting high speed streams, the lowest average IMF and solar wind densities ever recorded at 1 AU, and the lowest solar EUV fluxes in three solar cycles, placing system responses into a backdrop of tenuous ionospheric densities and low conductivities. Draft Agenda 30 June 2011, Session 1 Magnetic Activity during HSS 1330 Robert McPherron - Solar wind - magnetosphere coupling during high speed streams, in the recent solar minimum, and in the preceding solar minimum 1350 Raluca Ilie - periodicities in the solar wind and magnetosphere during HSS 1410 Vania Jordanova - ring current dynamics during high speed streams 1430 Jeff Thayer - CIR/HSS impact on the thermosphere 1450 Olga Verkhoglyadova ? Ionospheric TEC and thermospheric emission dynamics during HSS 1510 Yue Deng - Joule heating and 9-day periodicity of HSS 30 June 2011, Session 2 Radiation Belts and HSS 1600 Joe Borovsky - Radiation belts during weak high speed streams in 2006-2007 1620 Wen Li - Chorus waves seen on THEMIS during high speed streams High Speed Stream Effects in the Atmosphere-Ionosphere & Consequences 1640 Sharon Vadas - Differences in propagation and dissipation of gravity waves during SC24 1700 John Emmert - Causes and consequences of low thermospheric densities this minimum 1720 Stan Solomon: Upper atmosphere and ionosphere at Solar Minimum Summary, Discussion, and 1-2 Slide Contributions from Participants 1740-1800 This announcement is also available online at: http://www-ssc.igpp.ucla.edu/gemwiki/index.php/2011_CEDAR-GEM_Joint_Workshop#Joint:_High_Speed_Streams_and_Their_Geospace-Atmosphere_Consequences_Workshop ---------------------------------------------------------------------- 2. Call for Participation in Joint CEDAR-GEM Workshop: "Electrodynamic Coupling of the Ionosphere and Magnetosphere at Middle and Low Latitudes" ---------------------------------------------------------------------- From: Bela Fejer Thomas Immel Stanislav Sazykin Naomi Maruyama Joint CEDAR-GEM Workshop: "Electrodynamic Coupling of the Ionosphere and Magnetosphere at Middle and Low Latitudes" Session: Mon 27 Jun, 1330-1530 Room: Convention Center O'Keefe+Milagro We would like to invite presentations and participation in this session at the GEM-CEDAR joint workshop. The session description and a list of science questions are given below. The format of the presentations is informal with several slides and we would like to encourage science discussions. If you are interested to give a talk in the session, please let us know. Session Description: In the last decade, there have been many new development in understanding the electrodynamic coupling of the inner magnetosphere with the middle and low latitude I-T system. One of the great achievements was the identification and explanation of common magnetic-storm processes in plasmaspheric and ionospheric data and images, and the realization that disturbance dynamo and prompt penetration electric fields are not independent but interact with each other non-linearly. New developments continue to highlight the coupled nature of the system during quiet times as well as in response to magnetic storms. Significant gaps in our understanding still exist and lie in the need to quantify the various sources of electrodynamic variability at mid and low latitudes and the interactions and feedback between them. For instance, during quiet times, fluctuating winds in the thermosphere from sources in the lower atmosphere are likely to compete with fluctuation of magnetospheric sources, both in terms of driving winds and in imposing modest penetration electric fields. These sources of quiet-time fluctuations in the fields, render it extremely difficult to separate storm from quiet, since the background from one day to the next can be 50% of the signal. During storms the magnetospheric sources tends to dominate but lack of knowledge in the uncertainty in the quiet background can confuse interpretation of the storm response. This workshop is designed to bring together the CEDAR and GEM experts in the sources of mid and low latitude electrodynamics from the inner magnetosphere, thermospheric wind dynamo, and forcing from the lower atmosphere. New science questions to lead discussions: 1) Response of low and mid-latitude ionosphere to penetrating magnetospheric fields vs. disturbance dynamo. During a storm, the effects of both penetrating magnetospheric fields and disturbance dynamo fields drive changes in the ionosphere. What's typical, what's not? Does the F-layer go up or down, at what local times and for how long after storm onset? During disturbances, can the effects be reasonably separated or predicted? Do the responses depend on solar flux conditions? 2) Contribution of magnetospheric sources to quiet-time variability at low and mid latitudes. During periods of low geomagnetic activity, the ionosphere continues to exhibit large variability. Is this due only to sources such as tropospheric forcing, or is the ionosphere more susceptible to forcing from magnetospheric sources, owing to the low ionospheric/magnetospheric densities of recent solar minimum conditions? 3) Storm-time wind dynamo electric fields in the inner magnetosphere. The thermospheric winds that develop during geomagnetic storms drive electric fields that have a profound effect on the ionosphere. This disturbance dynamo develops after storm onset and persists for many hours after storm drivers lessen. These storm-time fields develop on magnetic L-shells that are usually occupied by cold plasma, but stripped of that during storms. What do the storm time dynamo electric fields look like from the point of view of the inner magnetosphere? Are these important for post-storm plasmaspheric dynamics? This announcement is also available online at: http://www-ssc.igpp.ucla.edu/gemwiki/index.php/2011_CEDAR-GEM_Joint_Workshop#Joint:_Electrodynamic_Coupling_of_the_Ionosphere_and_Magnetosphere_at_Middle_and_Low_Latitudes +-------------------------------------------------------------------+ | To subscribe GEM Messengers, send an e-mail to | | | | with the following command in the body of your e-mail message: | | subscribe gem | | To remove yourself from the mailing list, the command is: | | unsubscribe gem | | | | To broadcast a message to the GEM community, please contact | | Peter Chi at | | | | Please use plain text as the format of your submission. | | | | GEM Messenger is also posted online via newsfeed at | | http://heliophysics.blogspot.com and | | http://www.facebook.com/heliophysics | | | | Back issues are available at ftp://igpp.ucla.edu/scratch/gem/ | | | | URL of GEM Home Page: http://aten.igpp.ucla.edu/gemwiki | | Workshop Information: http://www.cpe.vt.edu/gem/index.html | +-------------------------------------------------------------------+