In this directory, you'll find subdirectories containing talks and a few posters that I've presented in recent years, usually in PowerPoint, sometimes in HTML or .pdf. Some subdirectories also contain movies associated with .ppt files. (Links in this file point to the file, not to the subdirectories.)

Order is reverse chronological: newest first.

• "Driving Models of the Solar Corona Using Photospheric Observations" (.pptx, 240 MB), a colloquium given at the Dept. of Astrophysical & Planetary Sciences at CU-Boulder in early April 2013. The same subdirectory also contains .pdf versions of the talk (much smaller, but no movies), either with or without slides that are "hidden" in the .pptx file.

• "Photospheric Drivers of Coronal Evolution" (.pptx) an invited talk at the LWS-SDO mtg. in Cambridge, MD, in March 2013 (.pdf versions of the talk, w/ and w/o hidden slides, in the same subdirectory), as well as presentations in "mini-workshops" on "issues" with HMI vector data and on flare forecasting using tracking / magnetic evolution.

• "Using Photospheric Data to Drive Coronal Field Models (.pptx)", a talk given in Berkeley's Space Physics Research Group weekly seminar series.

• "Evolution of the Photospheric Vector Magnetic Field in HMI Data (.pdf)," a poster presented at the AGU Fall meeting, 2012.

• "Estimating Free Magnetic Energy from an HMI Magnetogram (.pptx)," talk presented at "Tracing the Connections," a RHESSI meeting in Petaluma, California, 27 November - 2 December 2012. Also, a poster, "Flare-Associated Magnetic Field Changes Observed with HMI (.pptx)," with some very preliminary results using HMI filtergrams.

• "Image Segmentation & Discrimination Applied to Solar Magnetic Field Structure (.pptx)," a talk covering some image analysis techniques given in a research meeting of the CureFFI research team --- cross-disciplinary exchanges of ideas, baby!

• "New Directions for Improving Electric Field Estimates Derived from Magnetograms (.pptx)," a poster presented at the 2012 SHINE meeting.

• "Understanding Links Between the Solar Interior and Atmosphere (.ppt)", an invited talk presented at the LWS/SDO-3/SOHO-26/GONG-2011 Workshop, Stanford, CA, Oct. 31 - Nov. 4, 2011.

• "More Than You Want to Know About Estimating Photospheric Electric Fields (.ppt)", colloquium presented at the High Altitude Observatory, Boulder, CO, Sept. 28 2011.

• "More Than You Want to Know About Estimating Photospheric Electric Fields (.ppt)", presented in SSL's Space Physics Research Group seminar, fall 2011.

• "Quantitative Analysis of Observations of Flux Emergence (.ppt)", presented at the 2011 Flux Emergence Workshop, at UC-Berkeley's Space Sciences Lab.

• "Photospheric Flows and Magnetic Fields, and Their Role in CME/Flare Initiation (.ppt)," an invited talk at the IAGA-IUGG meeting in Melbourne, Australia, July 2011.

• "Using HMI to Understand Flux Cancellation (.ppt)", a poster presented at the 2011 Solar Physics Division (SPD) meeting in Las Cruces, NM.

• "Flux Emergence & the Storage of Magnetic Free Energy (.ppt)", an invited talk at the Community Workshop on Ground Based Solar Research in May 2010, in Boulder, CO.

• "Using HMI to Understand Flux Cancellation (.pdf)", a poster presented at the LWS/SDO Workshop at Squaw Creek, May 2011.

• "What can helicity redistribution in solar eruptions tell us about reconnection in these events? (.ppt)", a contributed talk at MR2010, the US-Japan Workshop on Magnetic Reconnection, Dec. 6-9, 2010 in Nara, Japan.

• "Beyond Black & White: What Photospheric Magnetograms Can Teach Us About Solar Activity (.ppt)", presented in research seminars at Nagoya University and Kyoto University, during a Short-Term Fellowship in Japan awarded by the Japan Society for Promotion of Science.

• "Beyond Black & White: What Photospheric Magnetograms Can Teach Us About Solar Activity (.ppt)", Harvey Prize lecture delivered at the American Astronomical Society's 2010 Summer Meeting, in Miami, FL.

• "Beyond Black & White: What Photospheric Magnetograms Can Teach Us About Solar Activity (.ppt)", presented in SSL's Space Physics Research Group seminar, spring 2010.

• "What can we learn about solar activity from studying magnetogram evolution? (.ppt)", presented at the National Solar Observatory, March 2010.

• "What is the Relationship Between Photospheric Flows and Flares? (.ppt)", a talk I gave on a visit to New Mexico State University, in Las Cruces.

• "Incorporating Magnetogram Data into Time-Dependent Coronal Field Models (.ppt)" , a poster I prepared, for which George Fisher was the official presenter, shown at the Fall AGU Meeting, San Francisco, CA, 18 Dec. 2009.

• "How are photospheric flows related to solar flares? (.ppt)", an oral contribution at the Fall AGU Meeting, San Francisco, CA, 15 Dec. 2009.

• "Photospheric Magnetic Evolution in NOAA ARs 10987, 10988, 10989", an invited talk at the 2^nd Whole Heliosphere Interval workshop, Boulder, CO, 11 Nov. 2009

• "How are photospheric flows related to solar flares? (ppt)", presented at the Lockheed-Palo Alto solar group's weekly seminar, 05 Nov. 2009.

• "How are photospheric flows related to solar flares? (ppt)", given in SSL's Space Physics Research Group (SPRG) Seminar, 13 Oct. 2009.

• "Photospheric Flows and Solar Flares (ppt)" (also .pdf), presented at the "Forecasting the All Clear Workshop," Boulder, CO, April 2009.

• "Active Region Flux Dispersal," a poster on the properties of active regions that have reappeared on the disk, presented at the Fall AGU meeting in San Francisco, Dec. 2008.

• The Physical Significance of Time-Averaged Doppler Shifts Along Magnetic Polarity Inversion Lines (PILs), presented at the Time-Distance Helioseismology Mtg. at Stanford, in late July 2008.

• The Magnetic & Energetic Connection Between the Photosphere & Corona, presented at the 2008 SHINE meeting in Zermatt, UT.

• Using Photospheric Flows Estimated from Vector Magnetogram Sequences to Drive MHD Simulations, presented at the SPD/Spring AGU meeting in Fort Lauderdale, FL, late May 2008.

• A talk, Estimating Surface Flows from HMI Magnetograms, presented at the HMI/AIA Teams Meeting in Napa, CA, late March, 2008.

• A talk, What can HMI teach us about flares & CMEs?, presented at the HMI/AIA Teams Meeting in Napa, CA, late March, 2008.

• A poster, Using Photospheric Flows Estimated from Vector Magnetogram Sequences to Drive MHD Simulations, presented at the HMI/AIA Teams Meeting in Napa, CA, late March, 2008.

• A colloquium at SWRI/Boulder, delivered during MTW3 --- the 3rd Magnetic Tracking Workshop --- on 26 July 2007. A README file in the SWRI07 subdirectory gives the URLs of two movies I used in this talk.

• A poster from the 2007 Solar Physics Division (American Astronomical Society) meeting in Honolulu, HI, "Magnetic Field Extrapolations and Current Sheets," by B.T. Welsch, I. De Moortel, J.M. McTiernan.

• From the 2007 Sac Peak Summer Workshop,
  1. My invited talk, "Surface Flows from Magnetograms," B.T. Welsch, W.P. Abbett, G.H. Fisher, M. DeRosa, M.K. Georgoulis, K. Kusano, Y. Li, D.W. Longcope, B. Ravindra, and P. W. Schuck
  2. I summarized some of the points in my talk in a manuscript.
  3. My poster, "On the Origin of Strong Gradients in Photospheric Magnetic Fields," Brian Welsch and Yan Li
  4. I also wrote a manuscript based upon this poster.

• From the 2006 Fall AGU, my invited talk, "How Does Free Magnetic Energy Enter the Corona?" Three movies are also linked in the AGU06/ subdirectory:
  1. Flux emergence in AR 8100.
  2. Filament eruptions near the south pole.
  3. An erupting ring filament.

• From the 2006 CAWSES meeting at the Earth Simulator in Yokohama, Japan, my invited talk, "Forecasting Space Weather with Dynamic Coronal Models." Two movies are also linked in the CAWSES/ subdirectory:
  1. A large-scale movie (.avi,4.3 MB) of MDI full-disk images of AR 8210 over the ~24 hrs. of 01 May 1998.
  2. A smaller-scale version (.mpg, 4.2 MB) of the same movie.

• From the 2006 SHINE meeting at the Zermatt Resort, Midway, UT:
  1. May 1998 Event Session Talks: Free Energy Comparisons in AR 8210
  2. May 1998 Event Session Summary
  3. May 13, 2005 Event (AR 10759) Summary

• From the 2006 HMI/AIA Team Meeting, Monterey, CA:
  1. Mapping Free Energy in the Solar Atmosphere: What can we learn from HMI & AIA?
  2. HMI, Photospheric Flows, and ILCT

• From the 2005 AGU meeting in San Francisco, CA:
  1. Comparisons of Free Energy Estimates in AR 9026

• From the 2004 PROM meeting in St. Andrews, Scotland, 1-3 Sept.
  1. Using Feature Tracking to Quantify Flux Cancellation
  2. Flux Collision Models of Prominence Formation

• From May 1998 SHINE Event talk, given in plenary session in late June 2004 SHINE meeting in Big Sky, MT.
  1. The main PPT file, may98_plenary.ppt
  2. Files linked in this presentation are in here.

• Discussion-starting slides for MURI meeting at UCB, March 2004.

• ILCT review for MURI meeting at UCB, March 2004.

• Seminar given at Lockheed-Martin's Palo Alto site, on a new technique for inferring photospheric flows, I+LCT, in PowerPoint (LMSAL.ppt)

• Invited talk given at September 2003 PROM meeting in Bozeman, MT, in PowerPoint. (Bundled with Pack'n'Go.)

• Invited talk given at July 2003 SHINE meeting in Maui, HI, in PowerPoint. (Both .ppz and .ppt files.)

• Friday Solar Lunch talk on Lionello et al., ApJ. v. 581, p.718, Magnetic Field Topology in Prominences, in HTML

• Friday Solar Lunch talk on Zhang and Low, Apj. v. 584, p. 479, Magnetic Flux Emergence Into the Solar Corona. III. The Role of Magnetic Helicity Conservation, in PowerPoint

• Mar. 13 2002 talk at the Institute for Theoretical Physics, on Magnetic Helicity Transport in the Quiet Sun.