Electric fields, electron precipitation, and VLF radiation during a simultaneous magnetospheric substorm and atmospheric thunderstorm

Journal Article · Tue Jan 01 00:00:00 EST 1980 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA085iA01p00055· OSTI ID:5535321

Bering, E A; Rosenberg, T J; Benbrook, J R; Detrick, D; Matthews, D L; Rycroft, M J; Saunders, M A; Sheldon, W R

A balloon payload instrumented with a double-probe electric field detector and an X ray scintillation counter was launched from Roberval, Quebec, Canada (L=4.1) at 0828 UT (0328 LT) on July 9, 1975. A magnetospheric substorm was observed locally between 0815 and 1100 UT, which produced a maximum ..delta..B of approx.500 nT at approx.0930 UT. A single-cell atmospheric thunderstorm developed northeast of Roberval beginning around 0925 UT which was most intense from approx.1000 to 1035 UT. Detailed study of the electrical properties of the thunderstorm, the X ray precipitation data, and VLF spheric data leads to three conclusions. First, the electrical coupling from the thunderstorm to the magnetosphere increases with frequency from dc to the VLF; for the observed storm the amplitude at the ionosphere of thunderstorm produced electric fields was not significant at frequencies below 0.1 Hz. Second, the atmospheric conductivity above the thunderstorm was observed to be about one-half the fair weather value prior to 1000 UT; decreased to about one-quarter the fair weather value at about 1000 UT; and remained depressed after the end of the thunderstorm. This result was contrary to that expected on the basis of previous work and is one which merits considerably more investigation. Third, the data show a high probability that half-hop whistlers initiated by sferics from the thunderstorm triggered energetic electron precipitation from the magnetosphere.

• Research Organization: Physics Department, University of Houston, Houston, Texas 77004
• OSTI ID: 5535321
• Journal Information: J. Geophys. Res.; (United States), Vol. 85:A1
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
LIGHTNING
ELECTRIC FIELDS
ELECTRON PRECIPITATION
RADIOWAVE RADIATION
MAGNETIC BAYS
ELECTRIC CONDUCTIVITY
MAGNETOSPHERE
STORMS
CHARGED-PARTICLE PRECIPITATION
DISASTERS
EARTH ATMOSPHERE
ELECTRIC DISCHARGES
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
PHYSICAL PROPERTIES
RADIATIONS
640203* - Atmospheric Physics- Magnetospheric Phenomena- (-1987)