2nd meeting

The meeting was held at ISSI Bern during week 24, 13 – 17 June 2022.

  • In addition to the official Team members, the discussion included the following young scientists (attending on site):
    • Ingrid Bjørge-Engeland, Birkeland Centre for Space Science, University of Bergen, Norway
    • Federica Defranchi Bisso, Technical University of Denmark, Denmark
    • Pierre Gourbin, University of Orleans, France
    • John Ortberg, University of California – Santa Cruz, USA
  • And the following researchers and young scientists from the Team members Institutions (attending online):
    • Brant Carlson, Cartage College, USA
    • Nikolai Lehtinen, Birkeland Centre for Space Science, University of Bergen, Norway
    • Stephen Lesage, University of Alabama – Huntsville, USA
    • David Sarria, Birkeland Centre for Space Science, University of Bergen, Norway
    • Anthony Schmalzried, CSIC – Instituto de Astrofisica de Andalucia, Spain
    • Chris A. Skeie, Birkeland Centre for Space Science, University of Bergen, Norway

Agenda:

  • Monday 13/06 – start 14:30.
    • M. Sargent – Welcome to ISSI!
    • M. Marisaldi – Introduction – project status
    • Space mission status / TGF catalogs
      • M. Briggs – The new Fermi TGF catalog
      • M. Marisaldi – The updated AGILE TGF catalog
      • A. Mezentsev – Properties of ASIM TGFs
    • Discussion: review paper update
  • Tuesdays 14/06 – start 09:00.
    • Aircraft / balloon missions
      • S. Celestin – The OREO balloon mission
      • N. Østgaard – The ALOFT flight campaign
    • Ground observations / new facilities
      • J. Ortberg – ground measurements in Europe and Japan
      • D. Smith – instrument design for ground measurements
      • A. Ursi – ground observations in Italy: the Gamma-Flash project
    • Theory and modeling developments
      • J. Dwyer – Downward TGFs; TGFs from positive leaders; Optical emissions associated with TGFs; Current pulses associated with TGFs
      • P. Gourbin – self-consistent modeling of RREAs and associated radio emissions
  • Wednesday 15/06 – start 09:00
    • Theory and modeling developments (continued)
      • A. Luque – Montecarlo methods and computation of cross-sections for runaway acceleration 
      • C. Köhn – TGF production between approaching streamer coronae
      • D. Sarria – Library of gamma-ray glows and application to previous observations
    • TGF science hot topics #1: TGFs and radio
      • S. Cummer – radio measurements associated to ASIM TGFs
      • A. Mezentsev – lightning activity associated to the Tonga eruption
      • M. Briggs – special TGF talk
    • TGF science hot topics #2: TGF and optical emission
      • I.Bjørge-Engeland – TGFs with accompanying ELVEs
      • C. A. Skeie – temporal relationship between TGF and optical pulses
      • A. Mezentsev – Discerning TGF and leader current pulse in ASIM observation 
  • Thursday 16/06 – start 09:00
    • TGF science hot topics #3: Multi pulse TGFs
      • N. Østgaard – Multi-pulse TGFs with ASIM
      • M. Marisaldi – Multi-pulse TGFs with AGILE
    • Mission concepts: new instruments / multi-spacecraft observations of TGF
      • E. Grove – New space instrumentation
      • M. Marisaldi – ASIM, Fermi, AGILE simultaneous observations of TGF
      • M. Briggs – the TRYAD mission
      • S. Celestin – the BEES mission concept
    • Discussion: science requirements for a new TGF mission
    • Discussion: funding opportunities in EU / USA and possible proposals
  • Friday 17/06 – start 09:00
    • Follow-up discussion
    • conclusions