scholarly journals Design, environmental and sustainability constraints of new African observatories: The example of the Mozambique Radio Astronomy Observatory

2013 Africon ◽  
2013 ◽  
Author(s):  
Domingos Barbosa ◽  
Miguel Bergano ◽  
Valerio A. R. M. Ribeiro ◽  
Anita Loots ◽  
Venkatasubramani L. Thondikulam ◽  
...  
Keyword(s):  
Radio Astronomy ◽  
Astronomy Observatory ◽  
Radio Astronomy Observatory

scholarly journals On the peculiarities in the spin-down of isolated radio pulsars

2012 ◽  
Vol 8 (S291) ◽  
pp. 208-208
Author(s):  
Augustine Chukwude
Keyword(s):  
Radio Astronomy ◽  
Time Resolution ◽  
Local Phase ◽  
Astronomy Observatory ◽  
Radio Pulsars ◽  
Short Term ◽  
Radio Astronomy Observatory ◽  
Long Term Changes ◽  
Timing Data

AbstractWe investigate the spin-down behaviour of a sample of 25 radio pulsars on decadal timescales (~ 18 years) using a continuous timing data obtained over a period of at Hartebeesthoek Radio Astronomy Observatory (HartRAO). Particular attention is placed on achieving a better time resolution of both the short-term and long-term changes in pulsar spin-down using local phase-coherent measurements of the spin-down rates (). We demonstrate that the spin-down of radio pulsars is generally complicated by a superposition of processes that may or may not be related. Specifically, our results show that (i) for 7 pulsars, the observed spin-down variation is largely stochastic, characterized by random and sustained jumps in of varying amplitudes, (ii) for 9 objects, the spin-down evolution shows dominant monotonic variations in superimposed on short-term stochastic jumps in the parameter, and (iii) for the remaining 9 pulsars, the long-term spin-down evolution is non-monotonic, dominated by some systematic excursion in the measured spin-down rates.

A Wideband Superconducting Filter Using Strong Coupling Resonators for Radio Astronomy Observatory

2009 ◽  
Vol 57 (7) ◽  
pp. 1783-1789 ◽  
Author(s):  
Tao Yu ◽  
Chunguang Li ◽  
Fei Li ◽  
Qiang Zhang ◽  
Liang Sun ◽  
...  
Keyword(s):  
Strong Coupling ◽  
Radio Astronomy ◽  
Astronomy Observatory ◽  
Radio Astronomy Observatory

scholarly journals The National Radio Quiet Zone and the Green Bank RFI Environment

1991 ◽  
Vol 112 ◽  
pp. 176-180
Author(s):  
Wesley A. Sizemore
Keyword(s):  
West Virginia ◽  
Radio Astronomy ◽  
Astronomy Observatory ◽  
Radio Astronomy Observatory ◽  
Radio Transmitters ◽  
History Of

Today, I would like to discuss with you the history of the National Radio Quiet Zone, the regulation procedures for fixed radio transmitters inside the NRQZ and the RFI environment at the National Radio Astronomy Observatory (NRAO) site in Green Bank, West Virginia.

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