Corona

The corona is the outermost layer of the solar atmosphere, consisting of extremely tenuous and very hot plasma.

- Plasma: H⁺ and e⁻
- Follows magnetic structures
- Temperature anomaly:
        - Magnetic reconnection provides the basic heating

        - Alfvén waves (wave heating) transport energy further out into space
- Radiation spectrum: X-rays (RX), EUV, and white light due to electron scattering
- Density: ~10⁻¹² of the photosphere
- Charged particles escape from the corona and move through our solar system as the solar wind.

We can destiguish different regions:

E Corona (L Corona – Line Corona)
Emission from highly ionized metals (Fe XIV, Ni XII, Ni XIII, Ca XV).
Ionization occurs at t = 2 million K.

K Corona
Thomson scattering by high-energy electrons.
The scattering does not affect the wavelength itself, but the electrons’ velocities cause a Doppler effect, which smears out the wavelengths and thus forms a continuous spectrum (continuum).

F Corona
Caused by dust that scatters photospheric light.
No change to the spectrum shape, and it shows an absorption spectrum; hence the Fraunhofer-line spectrum.

MoonSwatch - Omega Speedmaster Mission to Earthphase Moonshine Gold

Not only I was interesested in the Speedmaster as a Moonwactch but also the fact the MoonSwatch shows the phases of the Moon. And in the case of the MoonSwatch Mission to Earthphase, the watch shows aswell the phase ot the Earth from the Moon. At the 10 o’clock position, the earth phase indicator shows the Earth with oceans that glow blue under UV light. Beneath the earth phase indicator is an illustration of Snoopy and Woodstock on the Moon, marveling at the enchanting spectacle of Earth. The illustration showcases a phrase that appears only under UV light. At the 2 o’clock subdial, is a moon phase indicator with two radiant full moons, both coated with OMEGA’s Moonshine™ Gold. One of the moons is designed in the distinctive style of the world of Snoopy, while the other features a unique snowflake design. The design is unique for every model, ensuring that, just like snowflakes in nature, no two timepieces are ever the same.

I bought the watch last week in Brussels, together with my daughter.