Florida Halo Display

Florida Halo Display: A Spectacular Atmospheric Phenomenon

The Florida Halo Display is a captivating atmospheric optics phenomenon that occurs in the skies above the state of Florida. This breathtaking display of light and color is caused by the interaction of sunlight with ice crystals in the atmosphere, creating a stunning array of halos, arcs, and circles. While the phenomenon itself is not unique to Florida, the combination of atmospheric conditions and crystal orientations in this region often leads to particularly vibrant and intricate displays.

A Multitude of Optical Wonders

One of the most remarkable aspects of the Florida Halo Display is the sheer variety of optical phenomena that can be observed. From the colorful circumzenithal arc, which appears as a bright band of colors encircling the zenith, to the supralateral arc that tangents it, there is no shortage of awe-inspiring sights to behold. Additionally, a bright suncave Parry arc can be seen, accompanied by a distinctive 'gull-wing' upper tangent arc. Completing the ensemble are a 22° halo, sundogs, and a parhelic circle, each adding its own unique touch to the spectacle.

The Contrails' Contribution

Contrails, which are the visible trails left behind by aircraft, play an interesting role in the formation of these atmospheric halos. Contrails typically form at higher altitudes than the cirrus clouds responsible for halo formation. By observing the positions of the contrail shadows on the lower cirrus clouds, one can gain insights into the intricate interplay between these different layers of the atmosphere.

The Quest for Lowitz Arcs

The presence of a bright Parry arc often serves as a cue to search for rarer optical phenomena known as Lowitz arcs. These faint but captivating arcs can sometimes be glimpsed above sundogs. By employing color subtraction enhancement techniques, it is possible to discern an upper Lowitz arc reaching up to become tangent to the Parry arc. While these arcs may be elusive, the possibility of their presence adds an extra layer of excitement to the Florida Halo Display.

Unraveling the Mystery of Parry-Oriented Ice Crystals

To understand the origins of the Parry arc, it is essential to examine the unique characteristics of the ice crystals responsible for its formation. These crystals have a horizontal long axis, as well as upper and lower prism faces aligned horizontally. By visualizing three different ray paths, it becomes apparent how these crystal orientations give rise to the distinct Parry arcs observed in the Florida Halo Display.

The Enigmatic Lowitz Arcs

While the Parry arc may be visually dominant, Lowitz arcs offer a captivating counterpoint to their more prominent counterpart. When a crystal is rocked on its blue axis, white ray paths emerge, resulting in the formation of Lowitz arcs. Though faint, these arcs possess their own ethereal beauty, adding an element of mystique to the already enchanting Florida Halo Display.

Conclusion

The Florida Halo Display is a mesmerizing atmospheric phenomenon that showcases the wonders of light and ice crystals in the skies above Florida. From the vibrant circumzenithal and supralateral arcs to the elusive Lowitz arcs, this display offers a feast for the eyes and a source of wonderment for those fortunate enough to witness it. By understanding the unique characteristics of ice crystals and their interactions with sunlight, we can unravel the secrets behind these breathtaking optical phenomena. So, keep your eyes on the sky and prepare to be captivated by the celestial marvels of the Florida Halo Display.

Florida Halos

Seen by Leesa Brown at Kissimmee on November 22, '19.

From top, a bright colourful circumzenithal arc and, tangent to it, a supralateral

arc.

A bright suncave Parry arc and below it a 'gull-wing' upper tangent arc.

Then a 22° halo, sundogs and a parhelic circle.

The Contrails..

..are higher than the layer of halo forming cirrus. Check the positions of the contrail

shadows on the lower cirrus.

Whenever there is such a bright Parry arc, search for rarer Lowitz arcs. There is a

hint of something above the left hand sundog. A colour subtraction enhancement

hints also at the upper Lowitz reaching up to become tangent to the Parry arc.

Yes they are very faint, but taken together they offer a possibility of a Lowitz arc

Parry oriented ice crystals

The long axis is horizontal as are the upper and lower prism faces.

Shown are three ray paths forming Parry arcs.

Why look for Lowitz when there is a strong Parry arc?

Rock this crystal on the blue axis and the white ray paths produce Lowitz arcs.

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Reference Atmospheric Optics

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  • "Florida Halo Display". Atmospheric Optics. Accessed on March 28, 2024. https://atoptics.co.uk/blog/florida-halo-display/.

  • "Florida Halo Display". Atmospheric Optics, https://atoptics.co.uk/blog/florida-halo-display/. Accessed 28 March, 2024

  • Florida Halo Display. Atmospheric Optics. Retrieved from https://atoptics.co.uk/blog/florida-halo-display/.