2010 Workshop:HLPS 2 and MI Coupling
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HLPS-2 and Magnetosphere-Ionosphere Coupling
Location, Date/Time and Duration
4 hours
Conveners
Jan Sojka
Joshua Semeter
Bill Bristow
Tony van Eyken
Lie Zhu
Michael Nicolls
Workshop Categories
Altitudes: IT - Latitudes: polar - Inst/Model: radar - Other: Instruments/Models for Coupling and Structures
Format of the Workshop
Short Presentations
Estimated attendance
50
Conflicts with other workshops or Requested Specific Days
Please avoid conflicts with other SuperDARN or ISR workshops
Special technology requests
Descriptions
Magnetosphere-Ionosphere Coupling
The magnetosphere and ionosphere constitute a highly coupled system at high latitudes, whereby magnetospheric disturbances, guided by the convergent field, serve to radically alter densities, temperature, and flows in the ionosphere. These responses, in turn, affect the composition and configuration of the magnetosphere, via feedback, and the thermosphere, via plasma-neutral coupling. The study of these processes has long been a core interest of the CEDAR community. Recent advances in diagnostic capabilities are providing new insight into many long-standing questions about the high-latitude M-I-T system. The purpose of this workshop is to provide a forum for discussion of new science emerging from this new diagnostic evidence.
This is the first of two sessions dedicated to interactions within the magnetosphere-ionosphere-thermosphere system at high-latitudes (the other being HLPS2). If you are interested in making a brief presentation at either of these sessions, please contact Josh Semeter (jls@bu.edu), or Jan Sojka (shawna.johnson@usu.edu).
High-Latitude Plasma Structures (HLPS2)
This is the second of two sessions dedicated to the interactions within the magnetosphere-ionosphere-thermosphere system at high-latitudes (the other being Magnetosphere-Ionosphere Coupling). The focus of this session is to establish the critical HLPS problems to which the new observational facilities, modeling capabilities, and theoretical advancements can be brought to bear upon. The early HLPS campaigns and collaborations made significant progresses in many of these fronts, but more issues are still open for observational and theoretical research. This session will be mainly a round table discussion on the new research capabilities and their relevance to the open HLPS problems. Interested parties are invited to participate in the discussion and brief relevant presentations are also welcome. A short overview of the status of three HLPS-GAPS Peaceful Valley Workshops will be given. If you are interested in making a brief presentation, please contact Jan Sojka (Shawna.johnson@usu.edu) or Josh Semeter (jls@bu.edu).
Speakers
Selected speakers for MI Coupling (Semeter) are:
- Larry Lyons
- Shasha Zou
- Russell Cosgrove, Radar detection of a localized 1.4 Hz pulsation in auroral plasma, simultaneous with pulsating optical emissions, and Pi1B magnetic pulsations, at substorm onset
- Bill Bristow
- Joshua Semeter
There are no selected speakers for HLPS-2 (Sojka) because it is a round table discussion.
Workshop Summary
This is where the final summary workshop report will be.
2010 CEDAR HLPS Workshop Report
The 2010 High Latitude Plasma System (HLPS) workshop participants met in Math 100 at the University of Colorado, Boulder from 4:05 PM until 6:05 PM on Thursday, 24 June 2010. Although no formal attendance was taken, we estimated 80 participants were present. HLPS followed, in fact was a continuation of, the earlier Magnetosphere-Ionosphere Coupling Workshop. These two workshops set the stage for reinvigorating a magnetosphere (GEM) and ionosphere-thermosphere-mesosphere (CEDAR) collaboration which will be a key focus of the 2011 Joint GEM-CEDAR Workshop. A common feature of both workshops was a very active dialogue between discussion leaders (speakers) and the participants which focused on a solid exchange of “what we know”/“we do not know.” This is a good measure of GEM-CEDAR scientists willing to exchange knowledge. Both workshops focused on the new science that can be tackled based on the excellent new instruments. These include PFISR, RISR, SuperDARNs, GPS networks, all-sky networks, magnetometer networks, FPIs, etc. This was also complemented with the prospect that the southern high latitudes, Antarctica, is becoming heavily instrumented, hence, enabling conjugate HLPS studies.
The HLPS session began with a historic reflection of the three earlier High Latitude Plasma Structures (HLPS) CEDAR workshops that were held in Peaceful Valley, Colorado between 1992 and 1996. These workshops generated three Radio Science special sections in 1994, 1996, and 1998 that contained 30 HLPS papers. These publications identified the progress to date as well as documented key HLPS knowledge as of 1998. A sequence of 9 discussion leaders then described observational capabilities as well as outstanding questions relevant to HLPS. Michael Nicolls described the first 8 months ( 9/05 - 5/10) of the new Resolute Bay Incoherent Scatter Radar (RISR) observations as well as its capability with a highlight of how unexpected the plasma temperatures were. Following the RISR introduction, Hasan Bahcivan discussed the advantage of RISR higher space-time resolution for analyzing polar cap patches. The talk explored the dependence of patches on the solar wind and IMF and confirmed much of the earlier CEDAR HLPS findings, thus setting the stage for addressing the unresolved patch mechanism questions. A southern hemisphere update on the McMurdo Station SuperDARN radar was presented by Jeff Spaleta which was followed by Gary Bust’s presentation of the new Antarctic GPS deployment which leads to a total of about 30 GPS stations in Antarctica. Together these two presentations indicates that M-I coverage of the southern high latitudes is reaching levels of completeness that both hemispheres will soon be on very similar footing with regards to tackling conjugate studies. From a magnetospheric perspective, Larry Lyons excited the HLPS scientists by poising very specific joint GEM-CEDAR science questions of polar cap/Harang/SAPS/substorm physics. These challenging questions indicate the needs of further exploration of the active role of the ionosphere in the M-I coupling and a closer collaboration among GEM and CEDAR scientists. Michael Ruohoniemi demonstrated that SuperDARN would soon be able to capture large storms as they expand into mid-latitudes, which is another major research instrumentation upgrade for the SuperDARN network. Cesar Valladares brought to our attention that GPS instrumentation has now been placed all around Greenland. Cesar also posed a list of more than seven alternative outstanding plasma patch source mechanisms that new research needs to address. Ellen Pettigrew presented new results on IMF control of the large-scale high latitude convection electric fields. Larry Lyons’ student, Yue Deng, demonstrated that Joule heating associated with CIR-fast stream events caused thermospheric density enhancement which were correlated via a suitable time delay with Champ satellite observations.
Presentation Resources
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