Software for performing measurements on Solar synoptic images.
Download version v2.14
Summary
Sungrabber is an software for measuring position of various structures (e.g. Sunspots) on drawings and photographs of the Sun. It is primarily optimized for drawings and photographs provided by Kanzehöhe Solar Observatorium, but it can also be used for scans and photos from other sources. Measurements can be saved to a text file for further processing or to continue working on the same image later. Orientation of image can be normal (photo) or mirror (drawing scenario). Semi-automatic modes can dramatically increase speed and accuracy, and can be turned off/on if necessary.
Working with Sunspot drawings (mode 0)
- Open image file and select mode 0 (mirror orientation)
- Enter date and time (Settings->Date and time) needed for calculation of P, B0 and L0. Note: date and time from Kanzehöhe image file name is automatically recognized.
- Define Solar limb (Input->Sun's limb). At least 3 points must be defined. Autoselect mode is set to nearest. Software will check for a nearest point to the mouse which is darker than predefined value in the circle of predefined radius. If one is not satisfied with selected point, that point can be canceled by right mouse click.
- Define meridian/daily movement of the Sun (Input->Orientation). Choose aprox. direction of the east (to define correct quadrant). At least 3 points must be entered. Automatic mode is set to weighted (the center of "darkness") inside square of predefined side lengths.
- If the heliographic grid is fine than work can be saved (File->Save).
Working with Sunspot Images/photos (mode 3)
- Open image file and select mode 3 (normal orientation - assumed that orientation is exactly: north up and west left)
- Enter date and time (Settings->Date and time) needed for calculation of P, B0 and L0. Note: date and time from Kanzehöhe image file name is automatically recognized.
- Define Solar limb (Input->Sun's limb). At least 3 points must be defined. Autoselect mode is set to nearest. Software will check for a nearest point to the mouse which is darker than predefined value in the circle of predefined radius. If one is not satisfied with selected point, that point can be canceled by right mouse click.
- If the heliographic grid is fine than work can be saved (File->Save).
Input->New object can be used to make measurements on features in order to save them. Don't forget to File->Save before closing the program.
System requirements: