Oblique ionogram features associated with off-great-circle HF propagation at high latitudes

2001 ◽  
Author(s):  
N.C. Rogers
Keyword(s):  
Great Circle ◽  
High Latitudes ◽  
Hf Propagation

Measurements of the extent to which round-the-world HF propagation follows a great circle

1964 ◽  
Vol 52 (4) ◽  
pp. 418-419 ◽  
Author(s):  
R.B. Fenwick ◽  
O.G. Villard ◽  
E.C. Hayden ◽  
R. Bredek
Keyword(s):  
Great Circle ◽  
Hf Propagation ◽  
The World

Deviation of decameter radio waves from the great circle path at high latitudes

1991 ◽  
Vol 34 (2) ◽  
pp. 102-105
Author(s):  
N. F. Blagoveshchenskaya ◽  
A. N. Baranets ◽  
T. D. Borisova ◽  
V. A. Bubnov
Keyword(s):  
Great Circle ◽  
High Latitudes ◽  
Radio Waves ◽  
Decameter Radio ◽  
Great Circle Path

Modeling of HF propagation at high latitudes on the basis of IRI

2016 ◽  
Vol 57 (3) ◽  
pp. 821-834 ◽  
Author(s):  
D.V. Blagoveshchensky ◽  
O.A. Maltseva ◽  
M.M. Anishin ◽  
D.D. Rogov ◽  
M.A. Sergeeva
Keyword(s):  
High Latitudes ◽  
Hf Propagation

scholarly journals A ray-tracing model to account for off-great circle HF propagation over northerly paths

Radio Science ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
N. Y. Zaalov ◽  
E. M. Warrington ◽  
A. J. Stocker
Keyword(s):  
Ray Tracing ◽  
Great Circle ◽  
Hf Propagation ◽  
Ray Tracing Model

Motions of neutral hydrogen at high latitudes

1967 ◽  
Vol 31 ◽  
pp. 265-278 ◽  
Author(s):  
A. Blaauw ◽  
I. Fejes ◽  
C. R. Tolbert ◽  
A. N. M. Hulsbosch ◽  
E. Raimond
Keyword(s):  
Surface Density ◽  
Velocity Dispersion ◽  
Neutral Hydrogen ◽  
Hydrogen Gas ◽  
High Latitudes ◽  
Low Velocity

Earlier investigations have shown that there is a preponderance of negative velocities in the hydrogen gas at high latitudes, and that in certain areas very little low-velocity gas occurs. In the region 100° <l< 250°, + 40° <b< + 85°, there appears to be a disturbance, with velocities between - 30 and - 80 km/sec. This ‘streaming’ involves about 3000 (r/100)2solar masses (rin pc). In the same region there is a low surface density at low velocities (|V| < 30 km/sec). About 40% of the gas in the disturbance is in the form of separate concentrations superimposed on a relatively smooth background. The number of these concentrations as a function of velocity remains constant from - 30 to - 60 km/sec but drops rapidly at higher negative velocities. The velocity dispersion in the concentrations varies little about 6·2 km/sec. Concentrations at positive velocities are much less abundant.

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