Zobrazeno 1 - 10
of 31
pro vyhledávání: '"H. L. Rowland"'
Autor:
F R, Trainor, H L, Rowland
Publikováno v:
Journal of phycology. 4(4)
Colony formation in a synchronized Scenedesmus could be controlled by the addition of 0.05% Na3 citrate or 85 μM EDTA to modified Bristol's medium. No unicells were formed; only S. quadricauda-like or S. longispina-type colonies were observed in you
Autor:
H. L. Rowland
Publikováno v:
Journal of Geophysical Research: Space Physics. 104:4319-4327
Three-dimensional simulations show the ELF (extremely low frequency) radiation generated by heating the high-latitude D region and modulating the polar electrojet The simulations use a time-varying current perturbation in the D region. The ELF radiat
Observations and simulations of VLF harmonic generation with the high-power auroral simulation array
Publikováno v:
Journal of Geophysical Research: Space Physics. 101:27027-27033
We report experimental results from the high-power auroral simulation facility showing that the lower D region can be heated so as to produce either a single, narrowband ELF/VLF radiation signal at the modulation frequency or a signal containing the
Autor:
H. L. Rowland, R. F. Fernsler
Publikováno v:
Journal of Geophysical Research: Atmospheres. 101:29653-29662
Three different types of optical phenomena have been observed at high altitude above thunderstorms: an enhanced airglow (“elves”) at roughly ∼90 km; a reddish glow (“sprites”) from 50 to 90 km; and an upward moving, bluish emission (“jets
Publikováno v:
Journal of Geophysical Research: Space Physics. 101:7935-7945
Electromagnetic pulses (EMP) driven by lightning can cause breakdown of the neutral atmosphere in the lower D-region. Using a computer simulation model, we study the dependence of the breakdown on the pulse strength, the orientation of the lightning
Publikováno v:
Geophysical Research Letters. 22:357-360
A model for ionospheric density structures at the O+ ion gyroradius induced by the Arecibo heater during the recent El Coqui campaign has been developed. We find that (1) these density structures can be accounted for by the parametric decay of the hi
Publikováno v:
Geophysical Research Letters. 22:361-364
Large lightning discharges can drive electromagnetic pulses that cause breakdown of the neutral atmosphere between 80 and 95 km leading to order of magnitude increases in the plasma density. The increase in the plasma density leads to increased refle
Autor:
H. L. Rowland, J. D. Huba
Publikováno v:
Journal of Geophysical Research: Planets. 98:5291-5300
The propagation of electromagnetic waves parallel to the magnetic field in the nightside Venus ionosphere is presented in a theoretical and numerical analysis. The model assumes a source of electromagnetic radiation in the Venus atmosphere, such as t
Autor:
H. L. Rowland
Publikováno v:
Physics of Fluids B: Plasma Physics. 4:3883-3889
Summary form only given. A fully nonlinear electromagnetic fluid simulation code has been used to study the interaction of electromagnetic waves with a plasma at the critical layer. The code is two-and-one-half-D (two spatial dimensions and three vel
Autor:
M. J. Keskinen, H. L. Rowland
Publikováno v:
Radio Science. 41
[1] A model for the magnetospheric effects of ELF/VLF modulation of the auroral electrojet using high-power ground-based high-frequency radio waves is developed. The effects of ducted topside whistler wave power flux, as generated from ELF/VLF aurora