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Riveting RFI

Riveting RFI. Alvaro Lopez, Amanda Dixon, & Kyra Gutmann Sherando High School 185 S. Warrior Drive, Stephens City, VA 22655. What is a Pulsar? Pulsars are neutron stars that are a compact remnant of a supernova explosion and emit beams of electromagnetic radiation.

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Riveting RFI

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  1. Riveting RFI Alvaro Lopez, Amanda Dixon, & Kyra Gutmann Sherando High School 185 S. Warrior Drive, Stephens City, VA 22655 What is a Pulsar? Pulsars are neutron stars that are a compact remnant of a supernova explosion and emit beams of electromagnetic radiation. Electromagnetic radiation is “a form of energy emitted and absorbed by charged particles which exhibits wave-like behavior as it travels through space” (“Electromagnetic Radiation”). What is Radio Frequency Interference (RFI)? RFI is “any source of transmission that is within the observed frequency band other than the celestial sources themselves” (“Electromagnetic Interference”). Types of RFI Narrowband (some sources are cell phones, radio stations, TV stations, etc.) Broadband (an example of a source is electric power transmission lines that are at 60 Hertz or more) Indicators of RFI -A repeating pattern -DM Plot that peaks at the left of the plot -The DM = 0 -Sub-band Plot that has “snakebites” -Sub-band Plot that has horizontal lines -Time Domain Plot and Sub-band Plot may have curved lines (except in the occasion of a double pulsar system) -Pulse Profile can be either broadband or narrowband -Reduced χ2 is anything other than 1 -Time Domain Plot has part of its signal missing What are some sources of RFI? All types of transmitters, doorbell transformers, toaster ovens, electric blankets, ultrasonic pest control devices, electric bug zappers, heating pads, and touch-controlled lamps. The 2 is a lot greater than 1 so it is not noise. The DM for this plot is way out of range which means this could not be a pulsar because the maximum DM for this direction is 185.3 cm-3 pc. The Sub-band Plot does not transmit on all frequencies which could indicate that it is a manmade signal. The Pulse Profile shows that this type of RFI is broadband. The lines on the Time-Domain Plot are curved instead of vertical. Curved lines are only possible when it is a double pulsar system. This plot has a really large frequency of 479.95 Hz. The possible sources of a frequency this large are aircrafts, server rooms for computer power, military equipment, and hand-held machine tools. The Dispersion Measure Plot does not have a peak so it cannot be a pulsar. Works Cited "Electromagnetic Interference." Wikipedia. Wikimedia Foundation, 24 Apr 2013. Web. 07 May 2013. "Electromagnetic Radiation." Wikipedia. Wikimedia Foundation, 05 July 2013. Web. 07 May 2013.

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