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Related Experiment Video

Updated: Jul 12, 2026

Real-time Monitoring of High Intensity Focused Ultrasound (HIFU) Ablation of In Vitro Canine Livers Using Harmonic Motion Imaging for Focused Ultrasound (HMIFU)

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Advances in helioseismology.

K G Libbrecht, M F Woodard

Science (New York, N.Y.)

|July 12, 1991

Summary

Globally coherent solar oscillation modes offer a unique way to study the sun's interior. These precisely measured oscillations reveal new insights into solar structure and dynamics.

Area of Science:

* Solar Physics
* Helioseismology

Background:

* Globally coherent oscillation modes in the sun were discovered approximately ten years ago.
* These modes serve as a unique seismological tool for probing the solar interior.
* Previous research established the existence and potential of these oscillations.

Purpose of the Study:

* To discuss the properties of globally coherent solar oscillation modes.
* To explain how these modes enhance the understanding of the sun's internal structure and dynamics.
* To highlight the advancements in observational capabilities for solar oscillations.

Main Methods:

* Analysis of observational data detecting phase-coherent oscillations.
* Measurement of surface velocity amplitudes down to 2 millimeters per second.

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* Precise determination of thousands of mode frequencies to accuracies of 1 part in 10^5.

Main Results:

* Observations confirm phase coherence of solar oscillations for up to 1 year.
* Detection of extremely low surface velocity amplitudes (as low as 2 mm/s).
* High-accuracy measurements of thousands of solar mode frequencies (up to 1 part in 10^5).

Conclusions:

* Globally coherent oscillation modes are a powerful tool for solar seismology.
* These modes provide unprecedented insights into the sun's internal structure.
* Ongoing research continues to refine our understanding of solar dynamics through oscillation analysis.