Diamond dust is a captivating atmospheric optical phenomenon that occurs in extremely cold conditions. It involves the presence of tiny ice crystals suspended in the air, creating a stunning display of glimmering particles. While diamond dust shares similarities with other ice crystal phenomena, such as halos and sun dogs, it possesses unique characteristics that set it apart.
Imagine standing in Tampere, Finland on a chilly day, and suddenly being greeted by a breathtaking spectacle. This is precisely what Jari Luomanen experienced on March 7th, 2004. The sky was adorned with an extraordinary halo formed by diamond dust crystals. Unlike other atmospheric optical phenomena that typically occur at high altitudes within cirrus clouds, these shimmering ice crystals were present in the nearby cold air.
As Luomanen captured this remarkable sight, he couldn't resist reaching out towards the upper tangent arc, attempting to touch the ethereal display. His hand seemed to stir the swarm of crystal specks, enhancing the magic of the moment. Such an encounter leaves an indelible mark on one's memory.
Diamond dust forms when temperatures plummet well below freezing point. In these frigid conditions, water vapor freezes directly onto existing ice crystals, creating tiny, hexagonal platelets or columnar crystals. These delicate ice particles remain suspended in the air, reflecting light and producing an enchanting display.
Diamond dust crystals are typically small, measuring only a fraction of a millimeter in diameter. Their diminutive size contributes to their ability to remain aloft in the atmosphere for extended periods. As light interacts with these minute ice particles, it undergoes refraction and reflection, resulting in a mesmerizing play of colors and glints.
The appearance of diamond dust can vary depending on atmospheric conditions. In some instances, it may manifest as a faint haze, while in others, it can form a more distinct and elaborate halo. The crystals may align themselves horizontally, creating a shimmering veil known as the diamond dust veil. This veil can extend across the sky, transforming the surroundings into a breathtaking winter wonderland.
Temperature and humidity play crucial roles in the formation and intensity of diamond dust. Extremely low temperatures are necessary for the creation of these ice crystals. Additionally, low humidity levels ensure that the crystals remain small and do not grow too large or clump together.
While diamond dust shares similarities with other atmospheric optical phenomena, it possesses distinctive features that set it apart. Here are some points of differentiation:
To witness the enchanting beauty of diamond dust, one must venture into regions with extremely cold temperatures. Arctic and subarctic regions are ideal for experiencing this captivating phenomenon. However, diamond dust can occur in other cold areas as well, such as mountainous regions or even during particularly cold winters in temperate climates.
When searching for diamond dust, it is essential to find a location away from artificial light sources to ensure optimal visibility. Patience is key, as these displays are often fleeting and can disappear as quickly as they appear. Being prepared with a camera or smartphone to capture the ephemeral beauty can help preserve the memory of this magical encounter.
Diamond dust serves as a reminder of the awe-inspiring wonders that can be found within our atmosphere. Its delicate ice crystals transform the ordinary into the extraordinary, creating a spectacle that captivates and mesmerizes. Whether it is the subtle glimmers or the elaborate halos, diamond dust continues to enchant those fortunate enough to witness its splendor. So, keep your eyes peeled and your heart open to the magical world of atmospheric optics, for you never know when you might stumble upon the glistening allure of diamond dust.
This startling display at Tampere, Finland was experienced by Jari Luomanen (site) on 7th March ’04. The halo forming crystals are called diamond dust and were in the nearby cold air rather than high-level cirrus cloud. Individual ice crystal glints are visible. “That particular image is very dear to me: it was taken during the absolute peak of the display that really didn't last all that long. Just as I took the image I simply had to extend my arm towards the upper tangent arc to try and see whether I could touch it, to stir the crystal swarm just a bit. I was able to stir the specks of light with my hand. I'll never forget it.” ©2004, Jari Luomanen, shown with permission.
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"Diamond dust". Atmospheric Optics. Accessed on November 30, 2023. https://atoptics.co.uk/blog/diamond-dust/.
"Diamond dust". Atmospheric Optics, https://atoptics.co.uk/blog/diamond-dust/. Accessed 30 November, 2023
Diamond dust. Atmospheric Optics. Retrieved from https://atoptics.co.uk/blog/diamond-dust/.