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Autor: Jeff Lashley
Titel: The Radio Sky and How to Observe It
Verlag: Springer-Verlag
ISBN/ISSN: 9781441908834
Auflage: 1
Preis : CHF 37.00
Erscheinungsdatum:
Inhalt
Kategorie: Medien / Kommunikation
Sprache: English
Technische Daten
Seiten: 236
Kopierschutz: DRM
Geräte: PC/MAC/eReader/Tablet
Formate: PDF
Inhaltsangabe
Radio astronomy is far from being beyond the scope of amateurs astronomers, and this practical, self-contained guide for the newcomer to practical radio astronomey is an ideal introduction. This guide is a must for anyone who wants to join the growing ranks of 21st Century backyard radio astronomers. The first part of the book provides background material and explains (in a non-mathematical way) our present knowledge of the stronger radio sources - those observable by amateurs - including the Sun, Jupiter, Meteors, Galactic and extra-galactic sources. The second part of the book deals not only with observing, but - assuming no prior technical knowledge of electronics or radio theory - takes the reader step-by-step through the process of building and using a backyard radio telescope. There are complete, detailed plans and construction information for a number of amateur radio telescopes, the simplest of which can be put together and working - using only simple tools - in a weekend. For other instruments, there are full details of circuit-board layouts, components to use and (vitally important in radio astronomy) how to construct antennae for radio astronomy.

Jeff Lashley is a technical support engineer at the National Space Centre in Leicester, UK. He has written regularly for Sunderland and Dundee newspapers. His most recent article on Radio Astronomy was published in the Radio Society of Great Britain magazine Radcom, in January 2007.
Inhaltsverzeichnis
Preface8
Acknowledgements10
About the Author12
Contents14
Chapter 1: The Radio Sun18
The Solar Core18
The Radiative Zone20
The Convective Zone21
The Photosphere21
The Magnetic Dynamo21
The Chromosphere22
The Corona22
The Quiet Sun and the Blackbody23
Solar Flares24
Classification of Flares24
How Solar Flares Form26
Solar Flare Radio Bursts27
The Quiet Sun27
The Solar Wind28
Chapter 2: Jupiter31
The Structure of Jupiter31
Jovian Magnetic Field31
The Jovian Magnetosphere32
The Inner Magnetosphere33
The Middle Magnetosphere35
The Outer Magnetosphere36
Jovian Radio Emissions36
Decametric Radio Bursts37
Interpreting the Jovian Decametric Spectrum40
Chapter 3: Meteors and Meteor Streams42
Determination of R43
Determination of L44
Determination of C44
Radio Scattering off Meteor Trails44
Specular Reflection45
Modeling of Meteor Radio Scatter48
Underdense Trails49
The Overdense Trail49
Forward Scatter Radio Reflections50
Setting Up a Meteor Scatter Radio Receiving Station51
Choosing a Receiver51
The Antenna53
Choosing a Radio Channel54
Observing Technique54
Automating the Observations55
How to Confirm If Your System Is Working Properly56
The Annual Meteor Streams57
Annual Meteor Calendar57
Chapter 4: Beyond the Solar System71
Brightness and Flux Density71
Continuum Emission73
Thermal Bremsstrahlung Spectrum73
Cyclotron and Synchrotron Radiation74
The Synchrotron Spectrum76
Inverse Compton Scattering78
Emission Line Radiation78
The HI 21 cm Emission Line of Hydrogen79
The 3 K Microwave Background81
Pulsars81
Chapter 5: Antennae85
The Dipole86
A Simple Dipole89
A Folded Dipole89
Inverted V Dipole90
Large Loop Antennae92
Yagi Beam Antenna94
The Log Periodic Array96
Circular Polarized Antennae98
The Parabolic Reflector (The Dish)99
Antenna Impedance Matching104
Transmission Lines (Feeder Cables)104
Parallel Open Lead105
Coaxial Cables105
Impedance Matching106
Using Coaxial Cable as a Matching Unit108
Matching Stubs109
Matching Transmission Lines to Multiple Antennae109
Baluns111
Chapter 6: Setting Up a Radio Astronomy Station113
Selecting a Site for the Receiving Station113
Atmospheric Noise and Other Environmental Considerations114
Antenna Mounting115
Power Considerations116
Chapter 7: Radio Hardware Theory117
The Superheterodyne117
Measurement Scales121
The dBm Unit122
The dBmV122
The dBmV122
Noise122
Noise Factor, Fn123
Noise Figure, NF123
Noise Temperature, Te124
Sensitivity and Selectivity124
Image Rejection125
Third Order Intercept Point, IP3125
Chapter 8: Introduction to RF Electronics127
Passive Electronic Components127
The Resistor127
Capacitors130
Inductors132
Ferrite Materials (FT)133
Powered Iron Types (T)134
Crystal