Pollen Corona - Ontario, Canada

Last updated on September 16, 2023

Pollen Corona - Ontario, Canada: Exploring the Natural Phenomenon

When it comes to atmospheric optics, there are many fascinating phenomena that can occur, captivating both scientists and nature enthusiasts alike. One such phenomenon is the pollen corona, which was witnessed by Ray Jones of Belgrade, Montana during a fishing vacation in Ontario, Canada in June '07. This unique occurrence not only provides a visual spectacle but also offers valuable insights into the world of atmospheric particles and their interactions with light.

Understanding the Pollen Corona

So, what exactly is a pollen corona? Unlike its circular counterpart, the pollen corona is typically non-circular in shape. This distinct feature sets it apart from other optical phenomena. When comparing the observed pollen corona with Mie scattering calculations, it is predicted that scattering particles within the size range of 20-30 microns are responsible for its formation. These dimensions align perfectly with many types of pollen particles found in nature.

Multiple Rings and Monosized Tree Pollen

One of the defining characteristics of a pollen corona is the presence of multiple rings. These rings are a result of monosized tree pollen particles interacting with sunlight. As the light passes through these particles, it undergoes diffraction and interference, leading to the formation of concentric circles of varying colors around the light source. These rings create a mesmerizing and ethereal display in the sky.

The Boreal Forest Pollen Season

The timing of Ray Jones' observation is also significant. June in Ontario, Canada marks the peak of the boreal forest pollen season. During this time, numerous tree species release their pollen into the air, resulting in an abundance of pollen particles in the atmosphere. The yellow powder filmed on the lake surface serves as evidence of this intense pollen activity. The combination of these factors created an ideal environment for the formation of a captivating pollen corona.

Exploring the Science Behind the Phenomenon

To delve deeper into the science behind the pollen corona, it is crucial to understand the interaction between light and pollen particles. When sunlight encounters these particles in the atmosphere, it scatters in various directions. The scattered light waves interfere with each other, resulting in constructive and destructive interference patterns. These patterns give rise to the vibrant rings observed in a pollen corona.

The Role of Particle Size and Composition

The size and composition of pollen particles play a vital role in determining the appearance of a pollen corona. Pollen grains vary in size and shape depending on the plant species. The specific dimensions of these particles influence the diffraction and interference patterns they produce. Additionally, variations in pollen composition, such as the presence of pigments, can further enhance or alter the colors observed in the corona.

The Beauty of Nature's Optical Display

Witnessing a pollen corona is truly a remarkable experience that allows us to appreciate the intricate beauty of nature's optical displays. It serves as a reminder of the complexity and interconnectedness of the natural world. By studying and understanding phenomena like the pollen corona, scientists gain valuable insights into atmospheric particles, their behavior, and their impact on our environment.

In conclusion, Ray Jones' observation of a pollen corona in Ontario, Canada provides a fascinating glimpse into the world of atmospheric optics. The non-circular shape, multiple rings, and association with tree pollen all contribute to its unique characteristics. By exploring the science behind this phenomenon, we gain a deeper understanding of how light interacts with particles in the atmosphere. The beauty and complexity of the pollen corona serve as a testament to the wonders that can be found in our natural surroundings.

Pollen Corona - Ontario, Canada. Wittnessed by Ray Jones of Belgrade, Montana while on a fishing vacation in June '07. Why a pollen corona? It is (a) likely non circular, (b) comparison with Mie scattering calculations predicts 20-30 micron sized scattering particles - the right size range for many pollens, (c) there are multiple rings characteristic of monosized tree pollen and (d) it was the boreal forest pollen season and yellow powder filmed the lake surface. Image ©Ray Jones, shown with permission.

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