Close-up of AR 2386 2015 07 19 (19644021928)

Autor/Urheber:

john.purvis

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https://dewiki.de/b/141aae

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Wikimedia Commons

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Beschreibung:

Only one small discrete sunspot group visible today. AR2386 - there is another smaller scattered group, AR 2387, visible but not such an attractive target.

Some small pores are visible close to the sunspot and lots of granulations in the background - to give an indication of scale - each granulation is 1000km across.

You can see a light bridge dividing the umbra into 2.

AR 2386 is classified as Hsx

H – A visually unipolar sunspot group with penumbra. s – small, symmetric. Largest spot has mature, dark, filamentary penumbra of circular or elliptical shape with little irregularity to the border. The north-south diameter across the penumbra is less or equal than 2.5 degrees. x – undefined for unipolar groups.

Magnified view is with TeleVue Barlow x3 lens yielding a focal length of 2700mm.

Equinox 120ED scope with Baader Herschel wedge and Baader UV/IR cut filter. Hinode solar autoguider and Ioptron ZEQ25GT mount. Skyris 274m CCD camera.

Technical note - cleaned CCD sensor and Barlow with arctic butterfly static brush - really seemed to help - no repair brushes needed in PS.

Lizenz:

CC BY 2.0

Credit:

Close-up of AR_2386 2015_07_19

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