Colorful Clouds in Indonesia

May 5, 2026, 18:27
AsiaScience
A2

Colorful Clouds in Indonesia

Introduction

People saw colorful clouds in Indonesia. Scientists explain why this happened.

Main Body

The clouds had many colors. This is called cloud iridescence. Sunlight goes through small drops of water or ice in the clouds. This makes the colors. This happened in Bogor. The colors were very bright. This is not new. People saw similar clouds in Singapore, Vietnam, and Malaysia. Many people shared photos on the internet. Some people liked the photos. Other people did not believe the photos were real.

Conclusion

These clouds are rare. They happen when the sun and the clouds are in the right place.

Learning

The 'Some vs Other' Contrast

In the story, we see how to talk about different groups of people:

  • Some people liked the photos. →\rightarrow (A small group)
  • Other people did not believe them. →\rightarrow (A different group)

How to use this: When you have a big group, use Some for the first part and Other for the second part to show a difference.

Action Words (Past vs Present)

Look at how the text changes time:

  1. Past (It already happened):

    • saw (see →\rightarrow saw)
    • happened (happen →\rightarrow happened)

  2. Present (It is a general fact):

    • is (it is a fact)
    • makes (sunlight makes colors)

Rule: Use -ed to talk about the event in Indonesia, but no -ed to explain the science.

Vocabulary Learning

iridescence
A display of bright, changing colors that appears on a surface when the angle of light changes.
Example:The iridescence of the soap bubbles amazed everyone at the science fair.
Bogor
A city in Indonesia known for its cool climate and many gardens.
Example:I visited Bogor last summer to see the famous botanical gardens.
internet
A global computer network that allows people to share information and communicate.
Example:She used the internet to find recipes for her new cooking hobby.
photos
Pictures taken with a camera or phone.
Example:He posted his photos of the sunset on social media.
believe
To accept something as true or real.
Example:She could not believe that the sky was actually rainbow-colored.
real
Something that actually exists or happens, not imaginary.
Example:The scientists were excited to see the real phenomenon in the sky.
rare
Not occurring often; uncommon.
Example:Seeing such a colorful cloud is a rare event.
bright
Giving off a lot of light or shining strongly.
Example:The bright colors of the clouds made everyone stop and look.
shared
To give a part of something to others or to show together.
Example:They shared the photos with their friends on the internet.
clouds
Masses of water vapor or ice particles floating in the sky.
Example:The clouds were filled with bright, rainbow-like colors.
B2

Analysis of Colorful Cloud Formations in Indonesian Airspace

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

🚀 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.

🔍 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:

  • ❌ A2: The weather in Bogor is not like the weather in London.
  • ✅ B2: The weather in Bogor is vastly different from the weather in London.

🛠️ 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."

💡 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.
C2

Observation and Analysis of Atmospheric Iridescence within Indonesian Airspace

Introduction

Recent sightings of iridescent cloud formations over Indonesia have prompted public discourse and scientific clarification regarding the phenomenon.

Main Body

The observed atmospheric event, characterized by the manifestation of a polychromatic spectrum across cloud boundaries, is identified as cloud iridescence. This phenomenon is predicated upon the diffraction of sunlight through water droplets or ice crystals of uniform dimensionality within thin cloud layers. In the specific instance recorded over Bogor, the iridescence occurred within a pileus cap—a lenticular formation situated atop a cumulonimbus cloud. The vibrancy of the colors in this occurrence exceeded typical muted presentations, though the underlying mechanism remains consistent with standard diffraction patterns. From a comparative perspective, this event is distinct from nacreous clouds or coronae, despite shared iridescent properties. Historical and regional precedents indicate that such occurrences are not anomalous; similar sightings were documented in Singapore in 2017, Vietnam in 2024, and Malaysia in April 2026. Furthermore, the phenomenon has been subject to artistic documentation as early as 1911 by Edward Wilson in the Antarctic. Public reception of the event, disseminated via social media, ranged from aesthetic appreciation to skepticism regarding the authenticity of the imagery, though the prevailing sentiment was one of intellectual curiosity.

Conclusion

The event has been classified as a rare but documented instance of cloud iridescence resulting from specific solar angles and cloud morphology.

Learning

The Architecture of 'Nominalization for Academic Precision'

To move from B2 to C2, a student must transition from describing actions to conceptualizing states. The provided text is a masterclass in Nominalization—the process of turning verbs or adjectives into nouns to create a dense, objective, and authoritative tone.

◈ The Shift: From Action to Concept

Compare a B2-level description with the C2-level precision used in the article:

  • B2 approach: The colors appeared across the clouds because sunlight diffracted through water droplets. (Focus on the sequence of events/actions).
  • C2 approach: The manifestation of a polychromatic spectrum... is predicated upon the diffraction of sunlight... (Focus on the phenomenon as a conceptual entity).

◈ Linguistic Deconstruction

Note how the author avoids simple verbs in favor of Abstract Nouns + Static Verbs:

  1. "The manifestation of..." →\rightarrow Instead of saying "Colors appeared," the author treats the appearance as a manifestation (a noun), allowing for a more formal classification.
  2. "...is predicated upon..." →\rightarrow This is a high-level alternative to "depends on." It elevates the logical relationship between the cause (diffraction) and the effect (iridescence).
  3. "...uniform dimensionality..." →\rightarrow Rather than saying "the droplets were all the same size," the author uses dimensionality to shift the focus toward a geometric property.

◈ The 'C2 Effect': Density and Detachment

By utilizing nominalization, the text achieves Epistemic Distance. It removes the human narrator and the linear timeline, replacing them with a timeless, scientific analysis.

Key Transition Markers used in the text to maintain this flow:

  • From a comparative perspective... (Frames the entire subsequent paragraph as a conceptual analysis rather than a list of differences).
  • Prevailing sentiment... (Synthesizes a thousand individual reactions into one single, manageable noun phrase).

C2 Insight: To master this, stop asking "What happened?" and start asking "What is the name of the process that occurred?" Replace verbs of action with nouns of state.

Vocabulary Learning

iridescence (n.)
the quality of showing lustrous rainbow colors, especially in clouds.
Example:The sky displayed iridescence as sunlight refracted through the thin cloud layer.
manifestation (n.)
a visible or tangible expression of something abstract.
Example:The sudden fog was a manifestation of the humid air meeting cold temperatures.
polychromatic (adj.)
containing or exhibiting many colors.
Example:The aurora borealis is a polychromatic display in the night sky.
predicated (v.)
established on or based upon.
Example:The theory was predicated on the assumption that all particles are waves.
diffraction (n.)
the bending or spreading of waves around obstacles or through openings.
Example:The experiment demonstrated diffraction of light through a narrow slit.
dimensionality (n.)
the state of having dimensions; the number of dimensions.
Example:The model's dimensionality made it harder to visualize.
lenticular (adj.)
lens‑shaped; resembling a lens.
Example:The cloud formed a lenticular shape over the mountain ridge.
cumulonimbus (n.)
a towering cloud type associated with thunderstorms.
Example:The cumulonimbus cloud produced heavy rain and lightning.
anomalous (adj.)
deviating from what is normal or expected.
Example:The anomalous readings puzzled the scientists.
nacreous (adj.)
having a pearly luster.
Example:The shell's nacreous surface shimmered in the light.
coronae (n.)
plural of corona; a halo‑like ring of light around a bright object.
Example:The sun's coronae were visible during the eclipse.
skepticism (n.)
a doubtful or questioning attitude.
Example:There was widespread skepticism about the authenticity of the photos.
authenticity (n.)
the quality of being genuine or real.
Example:The museum's authentication process confirmed the painting's authenticity.
intellectual (adj.)
relating to the intellect or reasoning.
Example:Her intellectual curiosity drove her to study complex subjects.
morphology (n.)
the study of the form and structure of organisms.
Example:The bird's wing morphology adapted it for swift flight.
pileus (n.)
a cap‑like cloud formation.
Example:The pileus appeared as a white halo above the storm.