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Radio Astronomy: An Informal Talk

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The 100-meter Green Bank Telescope. Even Bigger than you Think. Jupiter in Radio. Saturn in Radio ... Small Radio Telescope Justification ... – PowerPoint PPT presentation

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Title: Radio Astronomy: An Informal Talk


1
Radio AstronomyAn Informal Talk
  • Presented to the
  • High School Students Science/Technology
    Conference
  • 19 October 2007
  • by
  • Dr. Harold Geller, GMU

2
What Ill talk about
  • Telescopes
  • Electromagnetic waves
  • Radioastronomy basics
  • NRAO at Green Bank, West Virginia
  • Small Radio Telescope at George Mason University

3
What does a telescope do?
  • Collect electromagnetic waves
  • Collecting ability proportional to the square of
    the diameter of the objective
  • Resolve electromagnetic sources
  • Related to the atmosphere, wavelength and
    curvature of the objective
  • Magnify surfaces of planets and the Moon
  • Magnification only of Moon, Sun and planets

4
Looking Beyond the Eyes
5
Optical Telescopes
Reflector
Refractor
6
Different Views of Sun
Sun in Hydrogen-alpha
Sun in X-ray
7
Radio Astronomy Basics
8
A Little More Detail
9
Janskys Original Radiotelescope
10
Grote Rebers Telescope
11
170 foot Diameter Radio-telescope at Green Bank,
WV
12
The 100-meter Green Bank Telescope
13
Even Bigger than you Think
14
Jupiter in Radio
15
Saturn in Radio
16
3C296 Radio/Optical Composite
17
A Vision for George Mason (based upon Univ.
Indianapolis)
18
Small Radio Telescope Justification
  • Radio science observations in the L-band
  • L-band lies in the 1400-1427 MHz region of the
    electromagnetic spectrum
  • detection of what astronomers call the 21-cm line
    of hydrogen
  • this is a portion of the hydrogen spectrum, in
    the radio region of the electromagnetic spectrum,
    which is generated by the neutral hydrogen clouds
    in the interstellar medium

19
Small Radio Telescope Justification
  • Observations in C-band, which is 4313-4338 MHz
    and 3788-3813 MHz
  • Radio science observations in the C-band allow
    for the radio emission examination of the moon,
    which acts as a body at a temperature of 200 K.
  • Students will be able to scan the moon, and
    detect the estimated 6000 joules of energy from
    the lunar surface.

20
GMU SRT Background
  • Funding
  • National Science Foundation
  • education portion of grant won by Dr. Rita
    Sambruna
  • Order History
  • ordered first week of June 2002
  • stated 12 week delivery time
  • received 15 October 2002
  • damaged antenna

21
GMU SRT Background Part II
  • Order History
  • boxes damaged
  • FedEx insurance inspector called and visited to
    assess damage - refused claim
  • replacement parts to be shipped by vendor
  • Base assembled on roof
  • 1 November 2002
  • Remaining electronics and replacement antenna
    parts received 30 January 2003

22
Did You Say Fragile?
23
Picking Up the Pieces on the Roof
24
Whistle While You Work
25
Tolerance
26
Cleanup On The Roof
27
The Base Of SRT
28
Servo Motors Attachment
29
Servos with Ring Assembly
30
Dish/Receiver Assembly
31
Readying for Final Mechanical Assembly
32
From Mechanical to Electrical
33
Assembled and Ready to Test
34
Sample Data
35
Even Smaller - Radio Jove
36
Small Radio Science Demonstration Projects
  • Undergraduate research
  • Steve Richardson
  • web site built with some results from data
    acquired using U of Indianapolis
  • http//physics.gmu.edu/arichar6/radio/index.html
  • prepared presentation for GMU innovations fair
  • prepared presentation for CPAC meeting at
    Bucknell University

37
Really Smoothing
38
Playing With The Data
39
A Potpourri Of Color
40
Family Portrait (radioastronomy conference)
41
Radio Astronomy Observatory at George Mason
University
42
Looking To The Future
43
GMU Optical Observatory
44
OnLine References
  • http//www.aoc.nrao.edu/intro/image.index.html
  • http//www.aoc.nrao.edu/intro/faq.html
  • http//donald.phast.umass.edu/fcrao/education/rep
    ort1.html
  • http//www.haystack.mit.edu/
  • http//www.jpl.nasa.gov/radioastronomy/
  • http//www.bambi.net/sara.html
  • http//radiojove.gsfc.nasa.gov/

45
Book References
  • Radio Astronomy by John D. Kraus
  • An Introduction to Radio Astronomy by Bernard
    Burke
  • The Amateur Radio Astronomers Handbook by John
    Potter Shields
  • Radio Astronomy for the Amateur by David
    Heiserman
  • Radio Astronomy (Above and Beyond) by Adele
    Richardson
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