South Pole 11th January 1999.
Fisheye view pointing away from the sun by Marko Riikonen .
This is usually a halo sparse region but here it is full of arcs, any one of which appearing singly in temperate climes would be a cause for celebration. Mouse over the "Halo key" to identify them.
Fisheye view pointing away from the sun by Marko Riikonen .
This is usually a halo sparse region but here it is full of arcs, any one of which appearing singly in temperate climes would be a cause for celebration. Mouse over the "Halo key" to identify them.
Plate crystals generate two bright120º parhelia.
Singly oriented columns produce the cross centered on the anthelic point. Two arcs, the Diffuse andTricker, make up the cross.
The upper Tricker arc is a loop and the whole arc is shaped like the Ancient Egyptian "ankh" hieroglyph.
A subhelic arc touches the top of the Tricker loop ~ a sign that their ray paths are closely related.
Wegener arcs converge at the anthelic point. There isn't ananthelion halo as such, it only appears bright because so many arcs overlap there.
Parry oriented columns also contribute to the Tricker and subhelic arcs. The antisolar and heliac arcs are sharp and bright in this view and the Hastings arc (see below) is more easily discerned from the prominent Wegener arc.
Singly oriented columns produce the cross centered on the anthelic point. Two arcs, the Diffuse andTricker, make up the cross.
The upper Tricker arc is a loop and the whole arc is shaped like the Ancient Egyptian "ankh" hieroglyph.
A subhelic arc touches the top of the Tricker loop ~ a sign that their ray paths are closely related.
Wegener arcs converge at the anthelic point. There isn't ananthelion halo as such, it only appears bright because so many arcs overlap there.
Parry oriented columns also contribute to the Tricker and subhelic arcs. The antisolar and heliac arcs are sharp and bright in this view and the Hastings arc (see below) is more easily discerned from the prominent Wegener arc.
 |  | Anthelic region arcs HaloSim simulation and image after levels adjustment followed by unsharp masking. The parhelic circle, Wegener, Tricker and diffuse arcs all cross the anthelic point. |
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