A range of different negative leader propagation modes as imaged with LOFAR
- 1University Groningen, Kapteyn Astronomical Institute, Groningen, The Netherlands
- 2Department of Physics and Astronomy, University of New Hampshire, Durham USA
- 3Department of Astrophysics/IMAPP, Radboud University Nijmegen, Nijmegen, The Netherlands
- 4Astrophysical Institute, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
- 5Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, The Netherlands
We have developed a time-resolved interferometric imaging in 3D (TRI-D) method for LOFAR data where the signals of 400 individual antennas are added coherently. This allows us to reach an even better resolution in 3D than with our original impulsive imager (based on a time-of-arrival-difference method and reaching a meter scale resolution) and still have a time resolution close to the impulse-response time of our system (25 ns).
After a short outline of the TRI-D technique we show that with this new imaging technique we can resolve the fine dynamics in the different negative leader propagations modes, varying from normal negative leaders with a stepping distance of the order of a few tens of meters to negative leaders at altitudes above 7 km that propagate with steps of a few hundred meter to Intensely Radiating Negative Leaders that propagate as a broad front with an area of up to km^2 over distances of a few kilometers.
How to cite: Scholten, O., Hare, B., Dwyer, J., Liu, N., Sterpka, C., Buitink, S., and ter Veen, S.: A range of different negative leader propagation modes as imaged with LOFAR, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-5965, https://doi.org/10.5194/egusphere-egu22-5965, 2022.
