Dr. Odette Collis stood before the Fellows of the Royal Institute on Tuesday afternoon with eleven pages of photometric measurements, two spectral charts, and the quiet authority of a woman who has spent thirty-six consecutive nights on a ridgeline with a telescope and a notebook.

The data, she said, are now unambiguous.

The Greymoor Highland luminous phenomenon — first documented by Collis on 3 February from the Cartwright Observatory — has brightened by 12 to 15 per cent over the five weeks since observation began. The rate of increase has been gradual but consistent, with no single night of dramatic change and no night of reversal.

“What we reported last week as a trend is now, I believe, a fact,” Collis said. “The brightening is beyond plausible atmospheric variation. Something beneath the ridge is changing, and it is changing in one direction.”

The presentation, delivered to approximately sixty Fellows and guests in the Meridian Lecture Room at Arundel Crescent, marks the first formal submission of data from the Greymoor observation programme since Collis and Dr. Maren Ilkley began spectroscopic work in late February.

Ilkley, who has operated the Royal Institute’s portable spectrometer on six observation nights since 26 February, presented the spectral analysis. The emission signature has remained constant throughout the brightening: strong lines of ionised nitrogen and trace sulphur dioxide, consistent with superheated gases venting through fractured rock.

“The consistency of the spectrum is as significant as the brightening,” Ilkley said. “If the gases were changing composition, we might be looking at a new process. But this is the same process, intensifying. The source is stable but growing.”

Professor Elara Whitstone, president of the Royal Institute, who chaired the session, noted that the photometric data will be incorporated into the geological survey specification currently being prepared for tender.

“The survey was mandated to assess copper deposits and seismic risk,” Whitstone said. “Dr. Collis’s data make the geothermal component not merely advisable but essential. We are looking at an active system, and we need to understand its depth, its extent, and its trajectory.”

The monitoring station — approved at 195,000 florins for construction and 48,000 florins per year in operating costs — remains on schedule. Equipment tenders close on 21 March. Construction is planned for April, with the station operational by mid-May, in time to support the deep geological survey.

Nils Haversten, chairman of the Miners’ Cooperative of Greymoor, attended Tuesday’s presentation. He declined to comment publicly but was observed in conversation with Whitstone for some time afterwards. The cooperative’s mining operations — approximately 2,000 tonnes of copper annually — lie within the same geological system that is producing the glow.

The brightening raises no immediate safety concerns for Greymoor’s scattered population, Collis emphasised. The glow remains a high-altitude phenomenon, visible above the ridgeline between approximately 10 PM and 2 AM on clear nights. No ground-level effects — heat, odour, or ground deformation — have been reported.

“The ridge is not dangerous,” Collis said. “It is interesting. There is a difference, and I wish more people appreciated it.”

She intends to return to the ridgeline on Tuesday night, weather permitting. The sky is forecast clear.