Transcript ppt - EU-HOU
EU-HOUMW training session Limassol, Cyprus December 6-7, 2011 EU-HOUMW Internet Educational Solar Radio Telescope Cezar LE ŞANU Research Assistant Astronomical Observatory-Planetarium Compartment University “ Ştefan cel Mare” of Suceava, Romania www.usv.ro
Atmospheric opacity www.wikipedia.com
Advantages of the radio astronomy Radio observations are possible: • during the day • on full Moon • on bad weather (cloudy sky) • inside and behind dust and gas clouds
1890 Thomas Alva Edison Source: www.nrao.edu
www
Source: www.nrao.edu
1897 Sir Oliver J. Lodge
Wilsing şi Scheiner (1896)
Source: www.nrao.edu
Charles Nordman (1900)
Source: www.nrao.edu
What is a radio telescope? http://radiosky.com/simple.html
LNB Small total power radio telescope using on the shelf Satelite TV Ku-band equipment Offset TV satellite dish Computer + data logging software Data acquisition board Analog satellite finder (modified) Power Supply 14-18V DC
Detect microwaves emitted by the Sun and approximate the temperature at ~11GHz (chromosphere) source: http://sun.kochi-ct.jp/e/observatory.html
Goal of the EU-HOU Internet Solar Radio Telescope • Bring to the classroom via Internet the Solar radio astronomy (1-2 hours theoretical background, data acquisition, exercises) • Easy access (user, password), automatic disconnection (10-30 min) • Multiple user access in real time to the acquired data • Easy hardware setup for host institutions - no PC server needed, no space/office needed, short cables (mains power, Internet LAN or WLAN) • Robust enough for long term, intensive use in various weather conditions
TVSat dish + Ku band LNB Embedded server controller Block diagram Az-El antenna rotator YAESU G5500 External IP camera Internet RF signal ~1GHz Digital comands Embedded server Analog position feedback User interface
Exercises examples
• Where is the Sun? – Calculate the Sun AZ/EL for a given location, date and time (
OR
use a calculator e.g. http://www.jgiesen.de/SunView/index.htm
) .
• Find Antenna Half Power Beam Width (parameter needed for the next exercise, Sun transit - 30 min data acquisition
OR
use the HPBW given in the antenna data sheet).
• Measuring the Sun temperature at 11GHz (10min data acquisition, measure the ground and sky temperatures and calculate the Sun ’ s temperature).
The Internet Solar Radio Observatory Imai Laboratory, Kochi National College of Technology, Japan source: http://sun.kochi-ct.jp/e/observatory.html
The Internet Solar Radio Observatory Imai Laboratory, Kochi National College of Technology, Japan source: http://sun.kochi-ct.jp/e/observatory.html
Source unknown