Finland Green Flashes

Last updated on September 16, 2023

Finland Green Flashes: An Enchanting Atmospheric Phenomenon

Green flashes are captivating optical phenomena that occur during sunrise or sunset when the last sliver of the sun disappears below the horizon. While green flashes can take on various forms, two types are commonly observed and photographed: the classical 'Jules Verne' flash and mock-mirage flashes. In this article, we will delve into the mesmerizing world of Finland Green Flashes, focusing on the latter type that occurs on the top of the sun's still visible disk.

Mock-mirage green flashes are known for their subtlety and are often more frequently captured through photography than witnessed with the naked eye. These flashes result from mirages formed due to the abnormal refraction of the setting sun's light as it passes through strong temperature gradients in the atmosphere. The differences in optical refractive index caused by these temperature gradients create mirages, which in turn give rise to the mock-mirage green flashes.

One particular condition necessary for the occurrence of mock-mirage green flashes is being situated above a temperature inversion layer. Temperature inversions are atmospheric conditions where warmer air lies above cooler air, contrary to the usual pattern of cooler air above warmer air. In such scenarios, the temperature gradient is steep, leading to pronounced variations in the refractive index of the air.

When witnessing Finland Green Flashes, it is crucial to position oneself at an elevated vantage point to increase the chances of observing this captivating phenomenon. The presence of a temperature inversion layer enhances the likelihood of experiencing these green flashes. Finland's diverse topography offers numerous opportunities to witness this enchanting spectacle, as it is home to numerous hills, mountains, and elevated regions that provide ideal viewing locations.

As the setting sun's light passes through the atmosphere, it undergoes bending or refraction due to the varying refractive indices caused by temperature gradients. This bending of light is responsible for the creation of mirages, which are optical illusions that distort the appearance of objects in the distance. In the case of mock-mirage green flashes, these mirages occur at the top of the sun's disk, resulting in a vivid green hue that lasts for a brief moment before fading away.

The intensity and duration of mock-mirage green flashes can vary depending on several factors. The strength and stability of the temperature inversion layer play a significant role in the prominence of these flashes. A well-defined and stable inversion layer can produce more pronounced and longer-lasting green flashes, while weaker or less stable inversions may result in fainter and briefer flashes.

Photographing Finland Green Flashes requires precision and careful timing. Capturing the elusive moment when the green flash occurs necessitates patience and expertise in landscape photography. Additionally, employing appropriate camera settings and equipment, such as filters and tripods, can greatly enhance the quality of the photographs and increase the chances of capturing these ethereal phenomena.

In conclusion, Finland Green Flashes are a captivating atmospheric spectacle that enchants both photographers and observers alike. The occurrence of mock-mirage green flashes on the top of the sun's visible disk is a result of mirages formed by abnormal refraction through temperature gradients in the atmosphere. To witness this enchanting phenomenon, positioning oneself above a temperature inversion layer and choosing elevated vantage points can significantly increase the chances of experiencing these mesmerizing flashes. Whether witnessed firsthand or captured through photography, Finland Green Flashes offer a glimpse into the breathtaking beauty and complexity of atmospheric optics.

Mock-Mirage Green Flashes, Finland imaged at Jakobstad Feb 17, 2009 by Jonas F�rste.

©Jonas F�rste, shown with permission.

There are several types of green flash but the ones most seen or photographed are (1) the classical 'Jules Verne' flash very close to the horizon as the last sliver of sun disappears and (2) ones like these, mock-mirage flashes on the top of the sun's still visible disk. Mock-mirage flashes are less conspicuous and more photographed than seen. Both are produced by mirages made in turn as the setting sun's light is abnormally refracted by passing through strong temperature gradients (therefore differences in optical refractive index) in the atmosphere. Mock mirage flashes are seen when you are above a temperature inversion layer,

Note: this article has been automatically converted from the old site and may not appear as intended. You can find the original article here.

Reference Atmospheric Optics

If you use any of the definitions, information, or data presented on Atmospheric Optics, please copy the link or reference below to properly credit us as the reference source. Thank you!