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Radio Remote Sensing of the Solar Corona

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Measuring Properties of Turbulence: Interferometer Phase Scintillations ... Phase Scintillations of a VLBI Interferometer: the data ... – PowerPoint PPT presentation

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Title: Radio Remote Sensing of the Solar Corona


1
Radio Remote Sensing of the Solar Corona
Steven R. Spangler Department of Physics and
Astronomy, University of Iowa
2
What we would like to know about the corona
  • Vector magnetic field
  • Plasma density
  • Temperature
  • Characteristics of turbulence

3
We are helped by direct spacecraft measurements
in interplanetary space
4
How do we measure B in the corona itself?
Direct measurements out here
Zeeman measurements here
5
Radioastronomical propagation measurements
Technique discussed here Faraday rotation
6
(No Transcript)
7
Measuring Properties of Turbulence
Interferometer Phase Scintillations
8
The Instrument The Very Large Array
Radiotelescope
Operated by the National Radio Astronomy
Observatory (NRAO)
9
The Very Large Array
10
The North Liberty (Iowa) Radio Telescope
11
Extragalactic sources provide constellations of
background objects
Mancuso Spangler, Astrophys. J. 539, 480, 2000
12
VLBI Phase Scintillations the technique
13
Phase Scintillations of a VLBI Interferometer
the data
14
Agreement of model and observed rotation measures
15
Conclusions and Summary
  • Radio remote sensing observations can measure
    properties of the plasma in the solar corona.
  • These observations have provided information on
    the strength and structure of the coronal
    magnetic field and the properties of turbulence.
  • Future investigations (observations being
    analysed, or in planning) can improve on the
    above results
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