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Updated: Jun 22, 2026

Scattering And Absorption of Light in Planetary Regoliths

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Published on: July 1, 2019

Lunar transient phenomena: topographical distribution.

B M Middlehurst, P A Moore

Science (New York, N.Y.)

|January 27, 1967

Summary

Transient lunar phenomena (TLP) sites are classified into three main types: maria-peripheral, ray craters, and dark-floored ring plains. These TLP locations are not found in the rugged southeastern lunar highlands.

Area of Science:

Lunar science
Astronomy
Geology

Background:

Lunar transient phenomena (TLP) are brief, unexplained visual events observed on the Moon.
Understanding TLP sites is crucial for lunar geology and observational astronomy.
Previous classifications of TLP sites have been limited.

Purpose of the Study:

To classify the known sites of lunar transient phenomena (TLP).
To analyze the geographical distribution of TLP occurrences.
To compare visual TLP records with permanent observational data.

Main Methods:

Analysis of nearly 400 reports detailing TLP occurrences.
Categorization of TLP sites into distinct classes based on lunar geography.
Comparison of visual TLP site data with available permanent records.

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Main Results:

TLP sites fall into three primary categories: peripheral to maria, ray craters, and ring plains with dark floors.
No TLP sites are reported in the rugged highland areas of the southeastern lunar quadrant.
Existing permanent records of TLP sites align with visual observations.

Conclusions:

The geographical distribution of TLP sites suggests specific lunar surface conditions may favor these events.
Further research into the characteristics of these three TLP site classes is warranted.
Consistency between visual and permanent records supports the validity of TLP site classifications.