Direct Observation of Prompt Solar Flare Perturbation to Stratospheric Electrodynamics

Details Direct Observation of Prompt Solar Flare Perturbation to Stratospheric Electrodynamics Direct Observation of Prompt Solar Flare Perturbation to Stratospheric Electrodynamics

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh22a..02h&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH22A-02

Physics

2712 Electric Fields (2411), 2716 Energetic Particles: Precipitating, 2730 Magnetosphere: Inner, 2794 Instruments And Techniques

Scientific paper

Several solar flare events were observed during the MINIS balloon experiment from SANAE station Antarctica, January 2005. The balloon payloads carried a large number of particle and field instruments which clearly identified several direct one-to-one perturbations between energetic particle flux enhancements, and the stratospheric electric field. Previous stratospheric electric field experiments have also detected one to one correlations with solar flares of both enormous size (August 1972) and quite small (February 1984). The flares during the MINIS flights produced a surprising influence on both the vertical electric field (as in the previous experiments) as well as on the horizontal electric field. The dramatic vertical electric field reductions, seen by MINIS as well as the earlier flights, may be directly related to the global circuit return currents and the influence of changing electrical conductivity. However, during the MINIS flight, we will show that the horizontal electric field also dropped to near zero. This could be caused by an abrupt cessation in large scale convection (at least locally), or by a rapid reconfiguration of the magnetosphere, perturbing the mapping of electric fields from the magnetosphere to the latitude of the balloon.

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