HYDROMAGNETIC EMISSIONS, X-RAY BURSTS, AND ELECTRON BUNCHES.
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
Pagination or Media Count:
Recent experimental results are presented about the occurrence, structure, and frequency latitude dependence of hydromagnetic emissions regular oscillatory micropulsations in the frequency range of 0.3 to 7 cps. Results are also presented for the occurrence of noise bursts irregular micropulsations in the same frequency range. Evidence is considered which suggests that both hm emissions and noise bursts are generated by related mechanisms. The existence of bunches of monoenergetic electrons oscillating back and forth along field lines in the magnetosphere has been suggested by a number of workers to explain various geophysical phenomena. The simultaneous occurrence of X-ray and hydromagnetic-emission bursts regular oscillatory micropulsations at frequencies in the range of 1 to 2 cps immediately after sudden commencements and during magnetically disturbed periods raises the possibility that hm emissions could be generated by such electron bunches. A model is presented that considers certain aspects of the motion of geomagnetically trapped electrons relevant to the production of hm emissions by electron bunches. A new result is the calculation of electron motion in a dipole field confined to the interior of a sphere as a first approximation to the solar wind cavity. Author