End of storm oscillation

From AMS Glossary
Revision as of 19:57, 26 January 2012 by Perlwikibot (Talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

end of storm oscillation

(Abbreviated EOSO.) A characteristic in the electric field signature at the ground near the end of a thunderstorm.

The electric field changes from upward-directed (foul-weather polarity) to downward-directed (fair-weather polarity) and often retains the latter polarity for several tens of minutes before returning momentarily to foul-weather polarity. Positive ground flashes and spider lightning are occasionally observed during the period of reversed field polarity. The origin of the EOSO is only partly understood.

Personal tools