Sunday, 3 July 2016

Filaments on the Limb - 3rd July

When the sun has few sunspots, in Ha wavelengths it is often the case that filaments are visible, cooler clouds of plasma held aloft the suns chromosphere by magnetic fields.  This was the the case today with quite a few being visible.  These were well revealed by the 203.2mm Airylab HaT telescope with a double stacked etalon and PGR Blackfly GigE IMX249 camera at a focal length of 5.6 metres.