THEMIS data products and access

Summary

The full-Sun guider images are mainly to provide context to the observations. They correspond to photospheric observations. They are broadband images taken in the green continuum, around 540 nm, with a bandpass of 10nm. They are not meant for pure scientific analysis. Images are provided as a .png files and have a size of 2000×3000 pixels².

The BBI camera offers a broadband high-resolution image with a square field-of-view of about ~55”x55“. Presently the images are taken with a broadband red filter, with a ~3nm passband centred around 656 nm. BBI images thus corresponds to visible-light red continuum images.

The images are 2000 x 2000 pixels, hence with pixel resolution of about 0.0275“/pixel. They are primarily provided as .fits files.

The MTR observation mode allows multi-line spectro-polarimetric observations. The available spectral cameras allows for simultaneous observation of a combination of up to 6 wavelengths. However observers usually limits their analysis to 3-4 wavelength. Available wavelengths are currently in the range [430-870] nm. Available combinations of wavelength depends on the actual position of the diffracted spectra at the exit of the spectrograph. The polarimeter is optimized for 6250Å and 4250Å.

For non polarized observations, for each channel, at each time, the dataset consists 2D image, with a variable wavelength across the field of view in one direction, and the spatial direction along the slit in the other directions. Each channel is centered on a different wavelength across the line profile.

Datas examples :