TBD: Contributions of MIT Coupling to Important Features… Open-closed field line boundary Equatorward boundaries of particle precipitation Plasmapause.

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Presentation transcript:

TBD: Contributions of MIT Coupling to Important Features… Open-closed field line boundary Equatorward boundaries of particle precipitation Plasmapause More? What are the critical boundaries? How do we map boundaries globally and instantaneously? How do compare boundaries determined at different levels of the M-I system? How do we validate boundary determinations across various techniques?

GEM-CEDAR Workshop, June 22-23, 2013 An AMPERE-derived proxy for the Open/Closed Field Line Boundary (OCB) in the Ionosphere Lasse Clausen, Mike Ruohoniemi, Jo Baker, and coauthors Virginia Tech

An AMPERE-derived proxy for the OCB The OCB marks a critical divide in magnetic field and particle properties We currently lack global auroral imaging capability for mapping the OCB In a series of recent papers, Clausen et al. [2012, 2013a, 2013b] demonstrated that current densities from AMPERE can be used to globally map the OCB, and to study the substorm cycle

First, current densities are analyzed on individual MLT meridians to find the peak R1 and R2 current locations, then (shown) these locations are fit across all MLTs to determine R1 and R2 peak current ovals

NH: Radius of R1 oval SH: Radius of R1 oval AL, AU IMF Bz Stackplot of indices and R1 oval parameters over two days Vertical guidelines are drawn through peaks in R1 oval size

The R1 oval compared to DMSP determinations of the OCB

Average situation of the R1 and R2 ovals at expansion phase onset, derived from superposed epoch analysis using 772 substorm events identified by THEMIS all-sky imagers.

An AMPERE-derived proxy for the OCB The solution for the R1 oval from AMPERE current densities provides a serviceable proxy for the OCB (~ 1 deg) Information is available at 10 min cadence most of the time; calculation of the total amount of open magnetic flux is straightforward Valuable for characterizing the state of the coupled M-I system, especially through the substorm cycle Available directly from Lasse, and soon from a web site. Summary:

An AMPERE-derived proxy for the OCB Lasse Clausen Postdoctoral Fellow University of Oslo, Department of Physics Postboks 1048 Blindern 0316 Oslo, Norway Phone: +47 (0) Clausen, L.B.H., J.B.H. Baker, J. M. Ruohoniemi, S.E. Milan, and B. J. Anderson (2012), Dynamics of the region 1 Birkeland current oval derived from AMPERE, J. Geophys. Res., 117, A06233, doi: /2012JA Clausen, L.B.H., J.B.H. Baker, J. M. Ruohoniemi, S.E. Milan, J.C. Coxon, S. Wing, S. Ohtani, and B. J. Anderson (2013a), Temporal and spatial dynamics of the regions 1 and 2 Birkeland currents during substorms, J. Geophys. Res., 118, 1-10, doi: /jgra Clausen, L.B.H., S.E. Milan, J.B.H. Baker, J. M. Ruohoniemi, K.-H. Glassmeier, J.C. Coxon, and B. J. Anderson (2013b), On the influence of open magnetic flux on substorm intensity: Ground- and space-based observations, J. Geophys. Res., 118, 1-12, doi: /jgra.50308

GEM-CEDAR Workshop, June 22-23, 2013 Application of POES particle data to characterize subauroral flows seen by mid-latitude SuperDARN Mike Ruohoniemi, Jo Baker, Bharat Kunduri, and other VT SuperDARN students Virginia Tech Credit: Bill Denig, Janet Green and NOAA NGDC

Large-Scale Map of SAPS Observations – April 9, 2011 CVW/CVE – Christmas Valley E/W FHW/FHE – Fort Hays BKS/WAL – Blackstone/Wallops O840 UT [From Clausen et al., 2012]

Fitting POES data for an Equatorward Auroral Boundary Red dot-dash: Fitted equatorward auroral boundary Background: Convection contours solved by fitting SuperDARN velocity data April 3, 2011 SAPS Event

Variation of POES Midnight Auroral Boundary with Kp

SuperDARN and SAPS Analysis of SAPS Occurrence, January 2011 – October 2012 ~ 160 event days identified Relations to Dst, Kp, and AE examined statistically Dst, Kp, and AE are characterized by their maximum value within the 0-12 UT interval

SAPS Occurrence Rate Versus Maximum Kp

Variation of Mean SAPS Latitude with Maximum Kp

Expansion of SuperDARN to Mid-Latitudes Mid-latitude SuperDARN coverage now extends continuously across 12 hours of MLT

TBD: Contributions of MIT Coupling to Important Features… Open-closed field line boundary Equatorward boundaries of particle precipitation Plasmapause More? What are the critical boundaries? How do we map boundaries globally and instantaneously? How do we validate boundary determinations across various techniques? How do we compare boundaries determined at different levels of the M-I system?