On 2025-01-12, I imaged the Sun in He I D3. Using my scripts to extract the weak signal, I got able to show features otherwise characteristic of the corona. I stacked a total of 72 scans, spanning between 2025-01-12-0741Z and 2025-01-12-0933Z. Basically, I imaged the fingerprint of the giant coronal hole.
my Helium concept against the SDO image
my Helium concept against the SDO image (negative)
the raw Helium I D3 reconstruction
the continuum, average of a few nearby wavelengths with no spectral events
the iron line, used as a guide to identify the Helium
helium – continuum delta
the He raw showing proms and instrument artefacts
and disk surface of the amplified signal
He I D3 concept
with the Sodium vapor lamp color
werk
