Excitation of geomagnetic micropulsations by means of ionospheric conductivity changes induced by solar flares. (Volumes I and II)

Thesis/Dissertation · Wed Jan 01 00:00:00 EST 1986

OSTI ID:7168646

Morris, P B

The premise is developed that solar flares with large components in the X-ray and euv spectra stimulate geomagnetic pulsations in the earth's magnetosphere by means of sudden conductivity changes in the dayside ionosphere. Ground-based observations of 7-22 mHz (Pc4 band) magnetic pulsations are shown to be associated with conductivity enhancements for four selected solar flare events in 1980. Magnetic activity was measured at four stations in a meridional chain in the US and Canada having magnetic shell parameters (L-values) between 3.2 and 4.4 and a conjugate station in Siple, Antarctica. Solar x-ray flux data from earth-orbiting satellites are used with an energy deposition model to calculate the time-dependent height-integrated conductivity tensor in the ionospheric region above each magnetometer site. Hydromagnetic wave theory is initially applied to a simple model of a cold magnetospheric plasma and a plane, anisotropic, conducting ionosphere to determine reflection coefficients and induced currents in the presence of reflected wave mode conversion.

• Research Organization: Michigan Univ., Ann Arbor (USA)
• OSTI ID: 7168646
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
EARTH MAGNETOSPHERE
PULSATIONS
SOLAR FLARES
IONOSPHERE
ELECTRIC CONDUCTIVITY
ULTRAVIOLET SPECTRA
X-RAY SPECTRA
VARIATIONS
EARTH ATMOSPHERE
ELECTRICAL PROPERTIES
PHYSICAL PROPERTIES
PLANETARY IONOSPHERES
SOLAR ACTIVITY
SPECTRA
640201* - Atmospheric Physics- Auroral
Ionospheric
& Magetospheric Phenomena
640201 - Atmospheric Physics- Auroral
Ionospheric
& Magetospheric Phenomena