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Radio Observatories

The largest and most visible scientific instruments on the PARI campus are the two 26 meter (85ft) radio telescopes.  Originally constructed by NASA for communications with manned spacecraft, PARI has invested more than $1 million to enhance the telescopes and adapt them for radio astronomy. Currently, the East telescope carries a receiver for studying pulsars.  The West radio telescope is used for studying the Milky Way Galaxy, supernova remnants and variable radio stars. PARI has received funding to purchase sensitive multiple frequency receivers for additional research into a phenomenon called IntraDay Variables (IDV). IDVs are unseen clouds of matter or dark matter in space. PARI’s telescope array will watch for changes in brightness from distant normally constant radio sources as a way of mapping the size and location of these clouds of material.

Perhaps the best known PARI radio telescope is the 4.6 meter (15ft) antenna, nicknamed “Smiley” because a Smiley face was painted on the dish as a friendly wave to Soviet satellites during the Cold War era.  Smiley is used remotely over the Internet by middle school and high school students.  PARI conducts workshops to certify teachers, and has developed several lab exercises the teachers can use in their classrooms.  The program has been supported by the NASA Space Telescope Science Institute IDEAS Program, the Z. Smith Reynolds Foundation and Progress Energy.  To date, about 200 teachers have been certified and Smiley has been used by more than 3,000 students, some as far away as Australia.

PARI has a 12 meter (40ft) radio telescope housed in a radome. When funding is secured, it will be used for a survey of the Milky Way Galaxy at 22GHz for water masers – regions of star formation.  A similar survey has been completed in the Southern hemisphere but none have been conducted for the Northern hemisphere.  The survey itself will take about seven years to complete and requires a dedicated precision surface telescope like the PARI 12m.

PARI operates a low frequency antenna for studying the effects of Solar flares on the Earth’s ionosphere and the effects of the interaction of Jupiter and one of its moons, Io.  The project is part of a worldwide effort called Radio Jove, managed by astronomers at NASA Goddard Space Flight Center.

 

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