Convenors: Jan Sojka and Cesar Valladares
Tuesday, June 15, 3:30-5:30 PM
ECCR1B40
Short Description: The HLPS working group ran a high latitude patches campaign during January 1999. Data was obtained from Sondre Strome ISR on the 14, 15, 16, 18 and 20 January and at this time the 1000 to 1700 UT period on 20 January is the prime period of interest. Cesar Valladares led this campaign from Sondre Strome and is leading the effort to bring together the data sets for this period. The workshop will focus on these campaign data sets as well as model predictions for the period. Presentation are solicited from scientists who have observations or model simulations. Round table discussions will be held on the multi-station and multi-instrument technique analysis of these campaign results. These discussions will also lay the groundwork for the next HLPS campaign. A topic of interest in this context would be polar cap arcs. Hence, we invited input on this topic from both conjugate and satellite points of view to augment the observation data bases. One specific aspect of these discussions will be initial HLPS efforts to collaborate with the "GIFT" (Global Ionospheric Forecasting Techniques) working group who are attempting to apply or establish space weather metrics. In this regard, HLPS campaigns and model simulations are extensive and advanced enough that a significant contribution to these metrics studies can be made.
Agenda: 1. Valladares. Motivation for the January 1999 High latitude campaign. 2. Pederson. ISR, digisonde, IMF data during the observations of Jan 20, 1999. 3. Ruohoniemi. SuperDARN Observations on Jan 20, 1999. 4. McEwen. Imager observations from Eureka 5. General discussions for future campaign on Dec 1999 or Jan 2000 6. Doe. Tomographic reconstruction of Sun-aligned arcs. 7. General discussion on transpolar arcs. a) Their possible detachment from the auroral oval. Does it occur only for transpolar arcs or is more general for any polar cap arc. b) motion controlled by IMF By. Does IMF Bz needs a southward excursion? c) Conjugacy. Is it possible to use ground-based imagers in addition to a satellite in the opposite hemisphere? d) mapping considerations. Do transpolar and polar cap arcs map to PS, BPS or magnetosheath? In the last 3 years there has been at least 4 papers that discussed some of these topics. These 4 papers are listed below. It is strongly encouraged to review the 4 papers prior to the beginning of the session. Upon request these can be mailed to the attendees of the HLPS session. The goal in this part of the session is to come up with a plan to experimentally (and theoretically if possible) resolve these issues. J.A. Cumnock et al. Evolution of the global aurora during positive IMF By and varying IMF By conditions, JGR, 489, 1997. J.V. Rodriguez et al., Antisunward decay of polar cap arcs, JGR, 27227, 1997. S.W.Chang et al. A comparison of a model for the theta aurora with observations from Polar, Wind and SuperDARN, JGR, 17367, 1998. P.T. Newell et al. JGR, 95, 1999.
Back to CEDAR Agenda 1999