20 m hz radio telescope with in phased dipole antenna


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radio telescope and its application in studying solar activities and decametric emissions from jupiter.

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20 m hz radio telescope with in phased dipole antenna

  1. 1. Using Radio Antennae To Study Solar ActivityBhupendra SubediMentor: Vayujeet Gokhale
  2. 2. How old is the concept?•  Karl Jansky first discovered radio waves in 1931.•  In his 1932 report mentioned that extraterrestrial sources cause radio interference•  Called the father of radio astronomy http://www.nrao.edu/whatisra/images/jansky4.jpg •  Grote Reber, an American engineer, in late 1930’s built the first-bowl shaped radio telescope. •  After years of failure, his radio telescope collected and measured radio waves given off by objects in space. http://http://www.nrao.edu/whatisra/images/grote1.gif
  3. 3. Seeing with Radio Telescope•  Normally we see •  Radio Telescope help when: electromagnetic us see when: radiation interacts with electromagnetic cells in our eyes radiation interacts with our detectors
  4. 4. Radio Spectrum and Projects http://www.radio-astronomy.org/pdf/sara-beginner- booklet.pdf
  5. 5. SID Radio (12-35 KHz)measures the amplitude fluctuation of radio signals from Radio transmitters after they have reflected from the ionosphere
  6. 6. SID Monitor http://www.qsl.net/dl4yhf/speclab1.jpgPower dB Perceival Andrews, How TO Build Your Own Radio Telescope
  7. 7. Itty Bitty Telescope (IBT) 12 GHZ
  8. 8. Fast Facts about IBT•  This is a 12,000 MHz radio telescope that can detect frequencies in the range of 12,200 to 12,700 MHz.•  It can detect the sun.•  It can detect blackbody radiation such as trees, buildings, people, when viewed against blank sky.•  It is an outdoor instrument.
  9. 9. 20 MHz Radio Jove Telescope With In-Phased Dipole Antenna •  The Radio Jove Program is a simple astronomy project that can monitor http://www.enterprisemission.com/ Solar and Jupiter Bursts. images/jupiter.jpg •v=f*λ • For 20.1 MHz, λ = v / fv/f"3*" 10 ^8 " m/s" )/(20.1 ∗ 10 ^6 = 14.925 m So, length of the dipole antenna = 14.925/2 = 7.4625 m. http://thewatchers.adorraeli.com/wp-content/uploads/2011/11/ hxrt_flter_fd_20111129_180351.png
  10. 10. The Dipole Antenna 3.76m E:DirDocumentRefJupiter.pdf Page 79 •  The more dipoles there are in the array, the wider the section of the sky is that signals can be gathered from. NASA Radio Jove Project• The combined length of the dipole is half the wavelength of the wave a radioastronomer is trying to observeSo, length of the dipole antenna = λ /2 = 14.925/2 = 7.4625 m.And each limb of the dipole = 7.4625/2 = 3.76 m
  11. 11. An example of a Jove graph Antenna Temperature Universal TimeAntenna Temperature: represents the brightness of the radiation source & is proportional to power per unit area emitted by the source
  12. 12. some sample graphs of solar, galactic activitiesAntenna Temp Deg. K * 1000 Universal Time
  13. 13. July 7, 2012 Truman State X class solar flare, Type 2
  14. 14. July 7,2012 Truman StateType 3 flarefollowed bytype 5 flare S.M White Solar Radio Burst and Space Weather By S.M White, Solar Radio Burst
  15. 15. Type 4 burstUnclassified burst By S.M White, Solar Radio Burst
  16. 16. Further Research1. Write a computer code for Itty BittyTelescope, there does not seem to be oneexisting2. Monitor Jupiter Bursts3. Correct the Sudden Ionospheric DisturbanceAmplifier and make it functional to study effectsof SID on radio signals from Radio transmitters.4. Study other areas of Radio FrequencySpectrum
  17. 17. References1.  Andrews,Percival.:2011 How to Build Your Own Radio Telescope2.  "What is it? What can it do?." National Radio Astronomy Observatory nPag. Web. 24 Aug 2012.http://www.aoc.nrao.edu/epo/teachers/ittybitty/3.  Theiman, Dr. James. "The Radio Jove Project." National Aeronautics and Space Administration n. pag. Radio Jove. Wev. 24 Aug 2012. http://radiojove.gsfc.nasa.gov/4.  White, Stephen M. "Solar Radio Bursts and Space Weather”5.  Verschuur, Gerrit L. The Invisible Universe Revealed. 2. New York: Springer-Verlag New York Inc., 1987. Print.6.  Burke, Bernard, and Francis Graham-Smith. An Introduction to Radio Astronomy. 2. Cambridge: Cambridge University Press, 1997. Print.7.  "Space Weather Monitors Stanford Solar Center." The SID Monitor. Stanford SOLAR Center, n.d. Web. 24 Aug 2012. <http://solar- center.stanford.edu/SID/sidmonitor/>. Thank You