SUNSHINE RECORDER Meteorology (Agronomy).pptx

Sun Shine Recorder

1. COLLEGE OF AGRICULTURE NAGAUR [AU,JODHPUR ] Submitted To : Dr. Neeshu Joshi Asst.Prof . Agronomy Submitted By : Kartik Phulwariya Kanika B.Sc ( Hons .) Ag.Part IInd SemII TOPIC : SUNSHINE RECORDER

2. INTRODUCTION A sunshine recorder is a device that records the amount of sunshine at a given location or region at any time. The results provide information about the weather and climate as well as the temperature of a geographical area. This information is useful in meteorology, science, agriculture, tourism, and other fields. It has also been called a heliograph It was invented by John Francis Campbell in 1853 and modified in 1879 by Sir George Gabriel Stokes.

3. There are mainly two types of Sunshine Recorder Campbell-Stokes Recorder Black-Larsen Recorder

4. Campbell-Stokes Recorder The Campbell-Stokes recorder (sometimes called a Stokes sphere) is a kind of sunshine recorder. It was invented by John Francis Campbell in 1853 and modified in 1879 by Sir George Gabriel Stokes.

5. Working Principle Campbell-Stokes Recorder The instruments are set up on flat roofs or on clear ground in such manner as to be well exposed to solar radiation, during the whole day. The type of instrument to be chosen depends on the latitude of the place of installation. This recorder consists essentially of a glass sphere of 10 cm diameter mounted concentrically in a section of a spherical metal bowl, the diameter of which is such that the sun`s rays are focused sharply on a card held into the grooves, in the bowl. Three overlapping pairs of grooves are provided in the bowl to taken up cards suitable for the different seasons of the year.

6. Working Principle Campbell-Stokes Recorder When sunshine is present the glass ball would focus the rays and burn a hole through a strip of photosensitive card. As the sun moves across the sky a corresponding hole would be made in the card. Different shaped strips of card are used to account for the change in the Sun's position in the sky throughout the year. Typically 3 shapes are available. At the end of each day, the card would be removed. The reader would measure the burn holes. The length of the holes made in the card would indicate duration of Sunshine during the day.

7. Different shaped strips used for sunshine recorder

8. Cards Season Period Grooves Short curved Winter 15 Oct – end of Feb Upper Long cuved Summer 12 April – 2 Sept Lower Straight Equinoxes 3 Sep – 14 Oct 1 March - 11 April Middle Particulars for Sunshine Cards for Different Seasons

9. Blake- Larsen Recorder Blake-Larsen Sun Shine Recorder was developed by Alan Blake (UK) and Ole Jul Larsen (Denmark)

10. WORKING The recorder unit and PC software produce a fully automated system to measure the duration of bright sunlight from dawn to dusk. The system will be very easy to integrate into WEB based weather recording systems as the sun shine records are simple text files. It will also produce sun shine reports including graphical presentation to a central WEB server and all the installation sites will be available worldwide using Google Earth like Software.