The TGF Workshop 2011 was held on the campus of the University of Alabama in Huntsville (UAH) on Wednesday and Thursday, July 13th and 14th. The workshop covered all aspects of Terrestrial Gamma-Ray Flash (TGF) science, including gamma-ray and radio observations, theory and future instruments. Proceedings The proceedings will be published by AIP in Spring 2012 and contributions should be submitted to the workshop organizers before C.O.B. Thursday Dec 1. Instructions for manuscript preparation are provided on the AIP website: http://proceedings.aip.org/authors/information_for_authors The 6" x 9" format will be used. Manuscripts should be prepared using the LaTeX macros provided under the "LaTeX Classes and Guides" section. The editors, Michael Briggs and Valerie Connaughton, will edit the manuscripts for typographical and typesetting issues, so authors should submit the LaTeX (.tex) version of their manuscript, the bibliography file, and all the figures (in .eps or pdf format) to be included in the compiled paper. The compiled pdf version of the paper, including figures and references, should be a maximum of 7 pages for invited talks or up to 5 pages for other contributions (oral or poster). Submissions and questions regarding submissions should be sent to: firstname.lastname@example.org . Invited Speakers Ashot Chilingarian (Artem Alikhanyan National Laboratory, Yerevan, Armenia): Thunderstorm Ground Enhancements (TGEs) – surface analog of TGFsJoseph Dwyer (FIT): TheoryGaopeng Lu (Duke): Radio ObservationsMartino Marisaldi (INAF-IASF Bologna): AGILE Observations Program The program is available. Presentations and posters I1: J. Dwyer: Understanding the source mechanisms of terrestrial gamma-ray flashesC1: U. Ebert: Electron run-away from streamers and leadersC2: B. E. Carlson: The TGF source luminosity distributionC3: S. Arabshahi: The role of the runaway breakdown – extensive air showers in thundercloud processesC4: S. Foley: Temporal Properties of Fermi TGFsC5: N. Ostgaard: Occurrence frequency and fluence of TGFs (by Carlson) I2: A. Chilingarian: Thunderstorm ground enhancements (TGEs) surface analog of the TGFsC6: R. A. Ringuette: Ground-based Observations of Terrestrial Gamma-Ray FlashesC7: S. Gupta: Search for particle acceleration during thunderstorm activity with the GRAPES-3 tracking muon detectorI3: M. Marisaldi: AGILE Observations of Terrestrial Gamma-Ray FlashesC8: G. J. Fishman: Observations of TGFs with BATSEC9: D. Smith: Status of ADELE and RHESSI observationsC10: M. S. Briggs: More TGFs from GBMC11: V. Connaughton: What can geolocated sferics tell us about Terrestrial Gamma-ray FlashesC12: P.-L. Blelly: The new XGRE instrument onboard TARANIS missionI4: G. Lu: Implications of radio frequency measurements for lightning processes associated with terrestrial gamma-ray flashesC13: M. Hutchins: Relative power of terrestrial gamma ray flash correlated lightning stroke to local stroke activityC14: S. Cummer: The lightning-TGF relationship on microsecond timescalesC15: J. Montanyà: Research on X rays produced by natural cloud-to-ground lightning in SpainP1: P. H. Bhat: Effects of recording dead time and pulse pile-up in the TGF data recorded by GBMP2: E. S. Cramer: Accurately Modeling Terrestrial Gamma-Ray Flashes Observed with GBMP3: J. E. Grove: Search for Terrestrial Gamma-ray Flashes with Fermi LATP4: C. Koehn: Modeling Bremsstrahlung and calculating energies and angles of hard photons ahead of lightning leadersP5: S. Sadighi: Streamer Emission from Thundercloud HydrometeorsP6: T. Sakamoto: Sprite observations by GRT-WF: - Correlative study of Sprites and TGFs.P7: F. São Sabbas: Cosmic Ray Count Rate Increases Associated with Thunderstorm Electric Field VariationsP8: M. Schaal: Electron Luminosity Measurements from Natural and Rocket-and-Wire Triggered Lightning using the Thunderstorm Energetic Radiation Array (TERA)P9: M. Splitt: Thunderstorm morphology of WWLLN located Terrestrial Gamma-Ray Flashes observed by FERMI-GBMP10: S. Xiong: Location prediction of Electron TGFs Sponsor and Organizers The TGF Workshop 2011 is sponsored by The Center for Space Plasma and Aeronomic Research (CSPAR) at The University of Alabama in Huntsville (UAH). Many of the scientists of the Fermi Gamma-Ray Burst Monitor (GBM) team, both from UAH and NASA/MSFC, are located at the NSSTC. Workshop attendees will be able to view the GBM Operations Center and spare GBM flight hardware. General questions for both the LOC and SOC should be emailed to email@example.com Local Organizing Committee (University of Alabama in Hunstville) Veronica BelserMichael BriggsElizabeth ComerValerie ConnaughtonShaolin Xiong Scientific Organizing Committee Michael Briggs (University of Alabama in Hunstville) (Michael.Briggs@uah.edu)Brant Carlson (University of Bergen) (firstname.lastname@example.org)Valerie Connaughton (University of Alabama in Hunstville) (Valerie@nasa.gov)David Smith (University of California, Santa Cruz) (email@example.com) Meeting Locations The meeting locations on the UAH campus can be found on this map. The scientific sessions will take place in Business Administration Building (#14) and the Reception and Lunches in the nearby Shelby Center For Science and Technology (#17).