|
Thanks everyone for the positive replies, appreciated!
(The MiniSHG image made SPOD on the SolarChat forum)
I've been asked, "Why does the MiniSHG image look so different to the CaK filter image?" Good question.
The bandwidth of the Lunt CaK filter is around 2.4A. This means that most of the light being recorded is coming from the wings (K1 regions) of the CaK absorption line.
These wings are close, only 500 Km above the photospheric level (i.e. white light, sunspots etc.) , whereas the SHG bandwidth of approx 0.2A allows us to observer and record the detail in the core (K3 region) of the CaK line which sits about 2,000 Km above the photosphere.
An analogy: the CaK filter shows the surface of the skin, spots, wrinkles etc. whereas the SHG sees the muscle and tendons below the skin.
Hence the difference in the two images.
HTH
|