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Interactive Applets and JAVA programs for Teaching Principles of Radio Astronomy

Interactive Applets and JAVA programs for Teaching Principles of Radio Astronomy. J. M. Marr <marrj@union.edu> and K. Durkota.

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Interactive Applets and JAVA programs for Teaching Principles of Radio Astronomy

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  1. Interactive Applets and JAVA programs for Teaching Principles of Radio Astronomy J. M. Marr <marrj@union.edu> and K. Durkota We have developed a set of JAVA files which can be used in undergraduate physics and astronomy classes as interactive demonstrations of some of the principles of radio astronomy. We will demonstrate: ● an applet to help students become familiar with the Fourier Transforms of basic functions; ● an applet in which the user inputs any number of virtual sources of any size in any location in the sky and the resulting visibility function is instantly displayed; ● a package of JAVA programs, designed primarily to analyze data from the Haystack VSRT Interferometer, but also useful without equipment to demonstrate the beam pattern, fringe function, and visibility function and how they depend on the wavelength, antenna size, antenna separation, and source structure.

  2. 1. Tool for Interactive Fourier Transforms (Applet) Instructions page at: http://www1.union.edu/marrj/Ast240/ToolforInteractiveFourierTransforms.html -One-dimensional -real functions only Cosine transform (not full FFT) -immediate response • Exercises: • Spike  Cosine wave. • X-value of Spike  frequency of cosine • Two neighboring spikes beat signal • Spike at x=0 constant function • Gaussian Gaussian • Widths of Gaussians • Fixes Needed: • Label of lower title • Save File

  3. Very Small Radio Telescope Interferometer_Plotter • (VSRTI_Plotter) (Java package) http://www1.union.edu/marrj/Ast240/VSRTI_Plotter.zip Designed for analyzing data in labs using the Haystack VSRT Interferometer, but also useful without data see “instructions” • Exercises: • Beam shape vs. D and l • Fringe pattern vs. b and l • Visibility pattern for: • - one source • - two sources • Fixes Needed: • Create Model Curve in Plot Visibilities • Save File • X-axis label in Plot Visibilities • Label of input buttons “DBaseline” in Visibilities, “Baseline” in Fringe Pattern

  4. 3. Visibility Function of Virtual Radio Sources (Applet—not w/ Internet Explorer, but Mozilla OK) http://www1.union.edu/marrj/Ast240/Applet_virtualsources.html Fixes Needed: -Currently, only shows even Visibility functions!! -Need to get working with all browsers.

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