HYDROMAGNETIC WAVES IN THE EARTH'S EXOSPHERE AND GEOMAGNETIC PULSATIONS

Journal Article · Mon Jan 01 04:00:00 EST 1962 · J. Phys. Soc. Japan

OSTI ID:4741297

Kato, Y; Tamao, T

S>A qualitative discussion on the physical characters in the exosphere is given. Using the propagation equation of hydromagnetic waves (HM-waves) in the particular coordinates and assuming Johnson's model of the exosphere, refractive indices for downward propagation of external HM-waves with specified period and wave length in the lower latitudes are obtained as a function of altitudes. It is shown that HM-waves propagating to the perpendicular direction to lines of force will be reflected at the particular level corresponding to their period, and a part of their energy will be transported into the lower region (higher latitudes) by means of transverse waves propagating parallel to the line of force through this level. It is suggested that primary sources of daytime continuous pulsations are attributed to large amplitude HM-disturbances in the outermost exosphere. Since these disturbances may have considerable wide band width of spectrum, T approx equal 1 sec plus or minus 3 x 10/sup 2/ sec, observed characteristics of daytime pulsations at the surface will be explained in terms of the filtering effect of the dispersive inner exosphere. It is also suggested that damped type pulsation, pt's, may be caused by the hydromagnetic compression of the local hot gas in the outer exosphere near the equatorial plane in the dark hemisphere, and this compression will occur as a result of the precipitation of trapped energetic electrons from this local region to the auroral zone. (auth)

• Research Organization: Tohoku Univ., Sendai
• NSA Number: NSA-17-012886
• OSTI ID: 4741297
• Journal Information: J. Phys. Soc. Japan, Journal Name: J. Phys. Soc. Japan Vol. Vol: 17: Suppl. A-II
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ATMOSPHERE
AURORAE
DISPERSION RELATIONS
EARTH
ELECTRONS
ELEMENTARY PARTICLES
ENERGY
EQUATIONS
FIELD THEORY
GASES
GEOPHYSICS
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
MATHEMATICS
MATRICES
MOTION
PERTURBATION THEORY
PHOTOPRODUCTION
PHYSICS
PRECIPITATION
REFLECTION
REFRACTION
SURFACES
TRANSPORT
TRAPS
VARIATIONS
ZONES