coronal hole: meaning, definition, pronunciation and examples
C1Technical
Quick answer
What does “coronal hole” mean?
A large, dark region in the Sun's corona where the plasma is cooler, less dense, and has open magnetic field lines.
Audio
Pronunciation
Definition
Meaning and Definition
A large, dark region in the Sun's corona where the plasma is cooler, less dense, and has open magnetic field lines.
A transient feature of the Sun's atmosphere from which high-speed solar wind streams originate, often associated with geomagnetic activity on Earth.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling remains consistent.
Connotations
None beyond its technical meaning.
Frequency
Used exclusively within scientific contexts in both regions with identical frequency.
Grammar
How to Use “coronal hole” in a Sentence
The satellite detected [NP: a coronal hole].Scientists observed [NP: the coronal hole] [PP: on the solar disk].Vocabulary
Collocations
Usage
Meaning in Context
Academic
Common in astrophysics, heliophysics, and space weather research papers and lectures.
Everyday
Virtually never used in everyday conversation.
Technical
Core terminology in solar astronomy and space weather forecasting.
Vocabulary
Synonyms of “coronal hole”
Neutral
Weak
Vocabulary
Antonyms of “coronal hole”
Watch out
Common Mistakes When Using “coronal hole”
- Confusing it with a sunspot (which is cooler but has closed magnetic fields).
- Using 'crown hole' as a direct translation.
FAQ
Frequently Asked Questions
No, they are not physical holes. They are regions in the Sun's outer atmosphere (corona) that are less dense and cooler, making them appear darker in certain observations.
Yes. The high-speed solar wind streaming from coronal holes can interact with Earth's magnetosphere, potentially causing geomagnetic storms that may disrupt satellite communications and power grids.
They are common, especially near the Sun's poles, and can be long-lived, sometimes persisting for several solar rotations. Their frequency and size vary with the solar cycle.
A sunspot is a cooler, dark region on the Sun's photosphere with intense magnetic activity and closed field lines. A coronal hole is in the hotter corona, has open magnetic field lines, and is a source of fast solar wind.
A large, dark region in the Sun's corona where the plasma is cooler, less dense, and has open magnetic field lines.
Coronal hole is usually technical in register.
Coronal hole: in British English it is pronounced /kəˈrəʊ.nəl həʊl/, and in American English it is pronounced /kəˈroʊ.nəl hoʊl/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of the Sun wearing a crown (corona) with a hole in it, letting the solar wind blow out faster.
Conceptual Metaphor
A FADED PATCH ON THE SUN'S SURFACE; A WINDOW FOR SOLAR WIND.
Practice
Quiz
What is a primary characteristic of a coronal hole?