IMPRS June 2003. The Nobeyama (Japan) radioheliograph Large antenna arrays are needed for imaging...
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Transcript of IMPRS June 2003. The Nobeyama (Japan) radioheliograph Large antenna arrays are needed for imaging...
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IMPRS June 2003
Space Instrumentation (7)
Lectures f or the I MPRS J une 23 to J une 27 at MPAe Lindau Compiled/ organized by Rainer Schwenn, MPAe,
supported by Drs. Curdt, Gandorfer, Hilchenbach, Hoekzema, Richter, Schühle
Wed, 25.6., 15:00 Radioastronomy f rom space (RS)
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IMPRS June 2003
The Nobeyama (Japan) radioheliograph
Large antenna arrays are needed for imaging objects on the sky in radiofrequencies, also for imaging the sun in radiofrequencies
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IMPRS June 2003
Radiobursts from the Sun
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IMPRS June 2003
Most spacecraft carry electric dipole antennae
The Helios solar probes
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IMPRS June 2003
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IMPRS June 2003
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IMPRS June 2003
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IMPRS June 2003
The emitted radiofrequency reveals the local plasma density,And, knowing the radial density profile, the distance of the
emitting region to the Sun
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IMPRS June 2003
A classcical Type III radio burst: energetic electrons progressing out from the Sun
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IMPRS June 2003
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IMPRS June 2003
Radio signals („bursts“) as remote sensors
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IMPRS June 2003
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IMPRS June 2003
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IMPRS June 2003
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IMPRS June 2003
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IMPRS June 2003
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IMPRS June 2003
„Solar Cosmic Rays“ cause radio bursts
http://lep694.gsfc.nasa.gov/waves/
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IMPRS June 2003
Height-time diagram of the May 3rd, 1999, CME, as determined from LASCO, and from drift rates of type II
radio emission.
The CME shock runs ahead
of
and simultaneously to
the metric type II shock.
They cannot be the same!
Radio signals („bursts“) as remote sensors
Maybe they can!
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IMPRS June 2003
Where the heliosphere ends
Radio signals from the heliopause!
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IMPRS June 2003
Where the heliosphere ends
Radio signals from the heliopause!
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IMPRS June 2003
The ROSETTA Mission (with PhD student M. Benna)
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IMPRS June 2003
The CONSERT Experiment
Sonde
Nucleus(?)
VHF (90 MHz)
Roland
Internal permittivity
of the nucleus
Structure and composition
of the nucleus
Phase and Attenuation
Data
Principal Investigator : Dr. Wlodek Kofman
(LPG -France) Countries : Germany, Italy, USA,Norway,
Netherlands & UK Masses : 2900 g Orbiter
1900 g lander DC Power : 3 W Orbiter
2 W Lander Frequency : 85 MHz à 95 MHz HF Power: 2,0 W Orbiter
0,2 W lander Data points / orbit : 3000
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IMPRS June 2003
Computation of dielectric properties ...
Porosity Distribution
Density distribution
Maxwell-Granett Mixing LawsSihvola & Kong*
3 components : silicates, water ice & voids
Dielectric permittivity distribution
(at 100 MHz)
Dielectric Absorption(at 100 MHz)
* Shivola A. & Kong J., 1988, IEEE Trans. Geo. & Rem. Sens., 26, p. 420-429.
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IMPRS June 2003