Let's measure the Sun's temperature by using Internet Solar Radio Dish (ISRO) antennae in Kochi,Japan!!

Step1 Receive the radio wave of Broadcast Satellite(BSAT-1a)

1. The position of BSAT-1a is azimuth 220 deg. and elevation 43 deg. from Kochi,Japan.
2. Click Set Angle in Control Panel
   Set Azimuth 220 and Elevation 043 in blank boxes
3. You can see that green line is over 2.0[V] in Real Time Plot the Detected Output.
4. It represents receiving radio waves of BSAT-1a!!

Step2 Catch the solar radio waves

1. Click Set Angle in Control Panel
   -Set each angle of the sun in the boxes for azimuth and elevation the right-
2. You can see that the green line is around 0.6[V] in Real Time Plot the Detected Output
3. It represents the solar radio waves!!

Step3 Receive the radio wave from the sky and the ground

1. To detect radio waves from the sky
   Click Controller in the Control Panel
   Select up bottom
   You can see the moving ISRD toward the sky and green line is around 0.4[V] in Real Time Plot the Detected Output.
   It represents receiving radio waves from the sky.
2. To detect the radio wave from the ground
   Click Controller in the Control Panel
   Select down bottom
   So, you can see moving ISRD toward the ground and green line is around 0.8[V] in Real Time Plotting the Detected Output.
   It represents the radio waves from the ground.

Step4 Calculate one point of the Sun's temperature

1. One point of the Sun's temperature is related to the Voltage of the sun, the sky, the ground as following :
   
   
   Where
   Temperature is each absolute temperatures and unit is Kelvin (0 K(elvin)=-273 ��),
   Temperature(ground) is 300 k in this time,
   Volt(sun) is obtained from Observational data of Control Panel at Step2,
   Volt(sky) and Volt(ground) is obtained from Observational data of Control Panel at Step3.

Step5 Calculation of the Sun's temperature

1. The entire Sun's temperature is calculated using the following relation:
   
   where
   Temperature(one point of the sun) is calculated Step4 results,
   (area ratio) is as following:
   
   where
   The half band width of this telescope is 3.12��,
   The apparent diameter of the Sun is 0.5��.
   Shortly,
   
   
2. If you can calculate the entire Sun's temperature is from 5000 to 10000k, you have gotten the temperature of the Sun!!
3. So, you have become an astronomer!!

Research

1. What are solar radio waves?
2. What are absolute temperatures?
3. What is thermal emission?
4. What layer of the sun are you measuring temperature?