TY  - JOUR
PY  - 1967//
TI  - Electric Currents Accompanying Tornado Activity
JO  - Science
A1  - Brook, M.
SP  - 1434
EP  - 1436
VL  - 157
IS  - 3795
N2  - Measurements of the magnetic field and earth current in the vicinity of a tornado show large steplike deflections coincident with the touching down of the funnel. Calculations with a simple current model indicate that a minimum current of several hundred amperes must be postulated to account for the observed deflection in magnetic field. The existence of a steady current of 225 amperes for a period of about 10 minutes provides joule heat at the rate of approximately 10(10) joules per second, and involves a total charge transfer of 135,000 coulombs. The calculations imply that a tornado is electrically equivalent to several hundred isolated thunderstorm cells active simultaneously.<p /> <p>Language: en</p> 
LA  - en
SN  - 0036-8075
UR  - http://dx.doi.org/10.1126/science.157.3795.1434
ID  - ref1
ER  -