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Rare optical phenomenon caught the attention of residents in the Bogor region of Indonesia after a rainbow cloud displayed intense shades of green, pink, and blue on May 1st. The episode went viral because it seemed like image editing, but the explanation is real: sunlight was diffracted by water droplets and small ice crystals.
Rare phenomenon took over the sky above Bogor, Indonesia, on May 1st, when a rainbow cloud with strong shades of green, pink, and blue caught the attention of residents and quickly spread across social media. The image impressed because the colors seemed too exaggerated to be natural, but the scene corresponds to what meteorology calls an iridescent cloud, a real and relatively uncommon atmospheric optical effect.
According to the portal Olhar Digital, what turned the case into something more than just a beautiful video was precisely the combination of visual impact and physical explanation. The rainbow cloud did not appear due to a filter, montage, or camera trick, but due to a rare condition where sunlight encountered very small and quite uniform particles of water and ice crystals within the cloud, scattering the colors irregularly and intensely.
The strongest detail is in the sharpness of the colors seen over Bogor
What most caught attention in the footage taken in Indonesia was the definition of the colors. Instead of a subtle glow, the cloud appeared with vibrant bands of green, pink, and blue, something that doesn’t always happen with this type of formation. It is precisely this sharpness that made so many people doubt the authenticity of the images right from the first shares.
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Although the phenomenon is known in meteorology, it does not usually appear so clearly in all cases. For the colors to stand out this way, the cloud needs to be thin and contain water droplets or ice crystals of very similar sizes, an atmospheric arrangement that does not form frequently.
The curious twist is that the sky seemed edited, but the effect is entirely real
The scene spread because it seemed unreal. In video, the cloud gave the impression of having been digitally colored, as if someone had saturated the sky. But the effect corresponds to a well-known optical process: the diffraction of sunlight as it passes through tiny particles suspended in the cloud.
This is the main difference compared to the traditional rainbow. In the common rainbow, the formation depends on the refraction of light in larger raindrops and usually results in a more defined arc. In the iridescent cloud, the rare phenomenon appears as colorful and irregular patches within the cloud itself, without the classic design people associate with a rainbow after rain.
The physical explanation helps to understand why this rare phenomenon almost never appears like this
According to the explanation of experts and educational materials about iridescence, sunlight needs to encounter tiny particles with similar sizes for the decomposition of colors to occur visibly. When the particles are very different from each other, the effect loses strength, and the colors practically disappear.
This is one of the reasons why the rainbow cloud usually appears in thinner, newly formed, or semi-transparent formations, such as altocumulus, cirrocumulus, lenticular, and cirrus. Under these conditions, light can pass through the cloud with the type of interaction necessary to produce the colors.
Why the phenomenon goes viral so quickly whenever it appears
The appeal of this type of image lies in the clash between science and appearance. The rare phenomenon does not pose an immediate danger, does not announce disaster, and is not a sign of extreme weather instability, but it seems so improbable that it instantly becomes a topic of discussion when it appears over urban areas or in very clear records.
In cases like Bogor’s, the sky ceases to be just a backdrop and becomes a spectacle. The mix of strong colors, irregular shape, and almost artificial appearance creates a type of image that immediately grabs attention and drives virality, especially because many people see the scene and imagine they are witnessing something impossible.
What still needs confirmation in such records
Even when the general explanation of the phenomenon is known, it is not always possible to pinpoint with total precision, from viral videos and photos, the exact composition of the cloud at the moment of the event. What experts can safely state is that the scene fits the classic pattern of iridescence caused by the diffraction of sunlight in water droplets and ice crystals.
It is also important to remember that the intensity of colors can appear even stronger on mobile phone screens and social media, depending on image processing and the device’s capture itself. This does not invalidate the phenomenon, but it helps explain why some recordings appear even more surreal than direct observation.
In the end, the sky seen over Indonesia did not just deliver a beautiful image. It showed a rare phenomenon where sunlight, water, ice, and atmospheric geometry combined with enough precision to transform an ordinary cloud into an explosion of color. And it is precisely because it depends on so many conditions at the same time that the rainbow cloud continues to seem impossible every time it decides to appear.
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