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You can join the foremost group involved with SIDs research The AAVSO or American Association of Variable Start Observers SID Program consists of solar observers who monitor very low frequency (VLF) radio stations for sudden enhancements of their signals Earth s ionosphere reacts to the intense X-ray and ultraviolet radiation released during a solar flare The ionospheric disturbance enhances VLF radio propagation By monitoring the signal strength of a distant VLF transmitter, sudden ionospheric disturbances (SIDs) are recorded and indicate a recent solar flare event All SID monitoring stations are home built by the observers The SID station operates unattended until the end of each month Recordings are then analyzed for the beginning, end, and duration of SID events A simple A/D converter design for specific use with the VLF receivers is available by contacting the chairman SID observers submit strip-charts or computer plots to the SID coordinator for visual inspection at the end of each month Many observers analyze their own stripcharts and computer plots Analyzed results are submitted via e-mail to the SID Analyst for correlation with other observers results The final SID report combines individual observers reports with the SID Coordinator visual analysis SID event results are sent monthly to the National Geophysical Data Center (NGDC) for publication in the Solar-Geophysical Data Report where they are accessed by researchers worldwide The reduced SIDs data and particularly interesting plots are reproduced in the monthly AAVSO Solar Bulletin mailed to all contributing members

Lou Helverson is a career librarian He began working at the Free Library of Philadelphia in 1952 while still in high school He taught for two years (he holds a BS in elementary education from Temple University), and then he returned to the library and earned a master s degree in library science from Drexel University He served as a branch librarian for twelve years and took over the automotive collection Helverson combines no-nonsense pragmatism and natural good humor with a researcher s curiosity, vast subject knowledge,

Figure 19-5 Loop antenna In normal operation, the SIDs receiver would be permanently tuned to a powerful VLF station such as (NAA), the powerful US Navy 24 kHz VLF transmitter station in the state of Maine, and your data-logger or A/D converter would constantly monitor the signal from NAA to record propagation changes on your personal computer for study Once the receiver has been completed, you can attach the antenna, power supply and data recorder Connect the output of the data recorder to your personal computer and you are ready to begin recording Now turn on the receiver and you should see a signal on your computer chart recorder display If you remove the antenna from the circuit the output should go to zero or base-line If your SIDs receiver does not appear to work, then you will need to disconnect the power supply and data recorder and antenna and inspect the circuit board for possible errors The most common cause for circuit failure after building a new circuit is the improper installation of components, such as electrolytic capacitors, diodes and semiconductors such as transistors or integrated circuits You may also want to check the placement of resistors