Earth-space propagation

2012 ◽  
pp. 335-363
Author(s):  
Bertram Arbesser-Rastburg ◽  
David Rogers
Keyword(s):  
Earth Space

Beacon-satellite observations of wave disturbances in the plasma of near-earth space

2004 ◽  
Vol 10 (2-3) ◽  
pp. 16-21
Author(s):  
O.F. Tyrnov ◽  
◽  
Yu.P. Fedorenko ◽  
L.F. Chernogor ◽  
◽  
...  
Keyword(s):  
Satellite Observations ◽  
Earth Space ◽  
Near Earth Space ◽  
Wave Disturbances

Wavelet analysis in problems of the near-to-earth space

2005 ◽  
Vol 11 (5-6) ◽  
pp. 22-29
Author(s):  
O.V. Lazorenko ◽  
◽  
S.V. Lazorenko ◽  
L.F. Chernogor ◽  
◽  
...  
Keyword(s):  
Wavelet Analysis ◽  
Earth Space

scholarly journals Metrics and Motivations for Earth–Space VLBI: Time-resolving Sgr A* with the Event Horizon Telescope

2019 ◽  
Vol 881 (1) ◽  
pp. 62 ◽  
Author(s):  
Daniel C. M. Palumbo ◽  
Sheperd S. Doeleman ◽  
Michael D. Johnson ◽  
Katherine L. Bouman ◽  
Andrew A. Chael
Keyword(s):  
Event Horizon ◽  
Earth Space ◽  
Sgr A

Some observations of anomalous depolarization on 19 and 12 GHz earth-space propagation paths

Radio Science ◽  
1977 ◽  
Vol 12 (3) ◽  
pp. 435-440 ◽  
Author(s):  
D. C. Cox ◽  
H. W. Arnold ◽  
A. J. Rustako
Keyword(s):  
Earth Space ◽  
Propagation Paths

scholarly journals Dynamical evolution of Oort cloud comets to near-Earth space

2006 ◽  
Vol 2 (S236) ◽  
pp. 43-54 ◽  
Author(s):  
Olga A. Mazeeva
Keyword(s):  
Dynamical Evolution ◽  
Absolute Magnitude ◽  
Oort Cloud ◽  
Outer Solar System ◽  
Earth Space ◽  
Near Earth Space ◽  
Long Period ◽  
Order Of Magnitude ◽  
Orbital Periods ◽  
Stellar Perturbations

AbstractThe dynamical evolution of 2⋅105 hypothetical Oort cloud comets by the action of planetary, galactic and stellar perturbations during 2⋅109 years is studied numerically. The evolution of comet orbits from the outer (104 AU <a<5⋅104 AU, a is semimajor axes) and the inner Oort cloud (5⋅103 AU <a<104 AU) to near-Earth space is investigated separately. The distribution of the perihelion (q) passage frequency in the planetary region is obtained calculating the numbers of comets in every interval of Δ q per year. The flux of long-period (LP) comets (orbital periods P>200 yr) with perihelion distances q<1.5 AU brighter than visual absolute magnitude H10=7 is ∼ 1.5 comets per year, and ∼18 comets with H10<10.9. The ratio of all LP comets with q<1.5 AU to ‘new’ comets is ∼5. The frequency of passages of LP comets from the inner Oort cloud through region q<1.5 AU is ∼3.5⋅10−13 yr−1, that is roughly one order of magnitude less than frequency of passages of LP comets from the outer cloud (∼5.28⋅10−12 yr−1). We show that the flux of ‘new’ comets with 15<q<31 AU is higher than with q<15 AU, by a factor ∼1.7 for comets from the outer Oort cloud and, by a factor ∼7 for comets from the inner cloud. The perihelia of comets from the outer cloud previously passed through the planetary region are predominated in the Saturn-Uranus region. The majority of inner cloud comets come in the outer solar system (q>15 AU), and a small fraction (∼0.01) of them can reach orbits with q<1.5 AU. The frequency of transfer of comets from the inner cloud (a<104 AU) to the outer Oort cloud (a>104 AU), from where they are injected to the region q<1.5 AU, is ∼6⋅10−14 yr−1.

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