Analysis of Colorful Cloud Formations in Indonesian Airspace

May 5, 2026, 18:27
AsiaScience

Introduction

Recent sightings of colorful, rainbow-like clouds over Indonesia have led to public discussions and scientific explanations about this natural phenomenon.

Main Body

The event is known as cloud iridescence, which happens when sunlight bends, or diffracts, through small water droplets or ice crystals of the same size in thin clouds. In the case of the sighting over Bogor, this occurred in a 'pileus cap,' which is a small cloud that forms on top of a larger cumulonimbus cloud. Experts emphasized that while the colors in this specific event were more vibrant than usual, the scientific cause is the same as in other similar cases. Furthermore, this event is different from other atmospheric phenomena like nacreous clouds or coronae. Such sightings are not unusual in the region, as similar events were recorded in Singapore in 2017, Vietnam in 2024, and Malaysia in 2026. Additionally, this phenomenon was documented as early as 1911 by Edward Wilson in the Antarctic. When the images spread on social media, public reactions varied; some people admired the beauty, while others questioned if the photos were real, although most were simply curious to learn more.

Conclusion

In conclusion, the event has been identified as a rare but well-documented example of cloud iridescence caused by the specific angle of the sun and the shape of the clouds.

Learning

๐Ÿš€ The 'Comparison' Jump: From Simple to Sophisticated

At the A2 level, you likely say: "This cloud is more colorful than that cloud." To reach B2, you need to describe differences and similarities using a wider range of professional structures.

๐Ÿ” The B2 Blueprint: "Different from" vs "Similar to"

In the text, we see this phrase:

"Furthermore, this event is different from other atmospheric phenomena..."

The Logic: Instead of just saying "It is not the same," B2 speakers use [Subject] + [be] + different from + [Noun].

Try this shift:

  • โŒ A2: The weather in Bogor is not like the weather in London.
  • โœ… B2: The weather in Bogor is vastly different from the weather in London.

๐Ÿ› ๏ธ Level Up: The "While" Contrast

Look at how the author balances two opposing ideas in one sentence:

*"...while others questioned if the photos were real, although most were simply curious..."

In A2, you use "But." In B2, you use "While" at the start of a clause to show a contrast. It makes your English sound fluid and academic.

The Pattern: While [Idea A], [Idea B].

Example: "While some people love the rain, others prefer the sun."

๐Ÿ’ก Vocabulary Upgrade: 'Vibrant' & 'Phenomenon'

Stop using "very colorful" or "thing." Use these specific B2-level anchors found in the text:

  1. Vibrant (adj.): Use this for colors that are bright and full of energy. (e.g., "The city has a vibrant nightlife.")
  2. Phenomenon (n.): Use this for an event that is impressive or unusual. (e.g., "The Northern Lights are a natural phenomenon.")

Vocabulary Learning

sightings (n.)
Observations or reports of something, especially something interesting or unusual.
Example:The recent sightings of colorful clouds attracted many onlookers.
public (adj.)
Open to all people; not private.
Example:The event was a public celebration that everyone could attend.
discussions (n.)
Talks or debates about a particular topic.
Example:There were lively discussions about the cause of the clouds.
scientific (adj.)
Related to or based on science.
Example:The scientists gave a scientific explanation of the phenomenon.
explanations (n.)
Reasons or reasons given to clarify something.
Example:The explanations helped people understand why the clouds appeared.
phenomenon (n.)
An observable event or fact.
Example:The colorful clouds are a natural phenomenon.
event (n.)
A particular occurrence or happening.
Example:The event took place over Bogor on a sunny day.
known (adj.)
Recognized or understood by many.
Example:It is a known atmospheric effect that scientists study.
sunlight (n.)
Light that comes from the sun.
Example:Sunlight bends when it passes through water droplets.
bends (v.)
Changes direction.
Example:The rays bend as they enter the droplets.
diffracts (v.)
Scatters or spreads when passing around an edge.
Example:Light diffracts around the edges of the droplets, creating colors.
thin (adj.)
Not thick; having little depth.
Example:The clouds were thin and translucent.
vibrant (adj.)
Full of bright, lively colors.
Example:The colors were more vibrant than usual.
unusual (adj.)
Not common or typical.
Example:Such sightings are unusual in the region.
documented (adj.)
Recorded or written down.
Example:The phenomenon was documented in 1911 by Edward Wilson.
rare (adj.)
Not common; infrequent.
Example:This is a rare example of cloud iridescence.
angle (n.)
The direction or slant of something.
Example:The angle of the sun affects the colors seen in the clouds.
shape (n.)
The form or outline of something.
Example:The shape of the clouds influences the effect.
curious (adj.)
Wanting to know or learn.
Example:Many people were curious about the cause of the colorful clouds.
reactions (n.)
Responses or feelings to something.
Example:Public reactions varied from admiration to skepticism.