Ventura College Geosciences

Ventura College Geosciences The official Ventura College Geosciences FB Page. A place to keep up with current department news and events.

As the official Ventura College Geosciences FB Page, this is where you can keep up with current department news and events, as well as learn interesting geoscience facts.

We'll be covering atmospheric optics in the last chapter of Weather & Climate.  Auroras are amazing!https://www.facebook...
03/29/2026

We'll be covering atmospheric optics in the last chapter of Weather & Climate. Auroras are amazing!
https://www.facebook.com/etherealearth1/posts/pfbid0qyyAwQevesh252VTKvkzR9LKJ6q9m7MGN9rmsWfcqxvVwazEEfmAmxsY6NATDL2Ml

Insane Aurora show from last night over Senja, Norway.

Extremely rare colors and formation.

Now, about those aurora colours and the science behind them:

The palette in this image — deep purples, vivid magentas, and eerie greens — actually maps quite well to real aurora physics. The colours come down to which gas molecules in Earth's atmosphere get struck by charged particles streaming in from the Sun (the solar wind), and at what altitude.

The greens are the most common aurora colour. They're produced by oxygen molecules being excited at altitudes around 100–300 km. When those oxygen atoms get hit by solar particles, they release photons at a very specific wavelength (557.7 nm), which our eyes perceive as that ghostly yellow-green.

The purples and magentas come from nitrogen. When nitrogen molecules at lower altitudes (below ~100 km) get ionised — meaning electrons are actually stripped away — they emit blue and red light. The blend of those wavelengths is what your eye reads as purple or violet. Sometimes you also get purplish-pink hues from nitrogen recombining with electrons after being ionised.

The reddish tones near the horizon come from oxygen too, but at much higher altitudes (above 300 km). Up there, oxygen atoms are spread very thin and release energy more slowly, emitting at a red wavelength (630 nm) instead of green.

The whole process starts with the Sun ejecting bursts of charged particles during solar storms. Earth's magnetic field funnels those particles toward the poles, where they slam into atmospheric gases and excite them — causing them to glow. The swirling shapes come from the structure of Earth's magnetic field lines and shifting currents within the solar wind. The more intense the solar storm, the more dramatic and colourful the display.

https://www.facebook.com/alisa.s.moore/posts/pfbid02YCXh6D3VX2nShZctDsDSMuVpozbv5jHqBtRNtHXF5DmLoD6trNsCNeUuFUxP4LUal
12/17/2025

https://www.facebook.com/alisa.s.moore/posts/pfbid02YCXh6D3VX2nShZctDsDSMuVpozbv5jHqBtRNtHXF5DmLoD6trNsCNeUuFUxP4LUal

Her name was Tilly Smith. And she was about to prove that a single school lesson could mean the difference between life and death.
On the morning of December 26, 2004, Tilly was walking along Mai Khao Beach in Phuket, Thailand, with her family. They were on their first overseas holiday together—a Christmas treat.
The beach was beautiful. The weather was perfect. But something was wrong.
Tilly noticed the water wasn't behaving normally.
"It wasn't calm and it wasn't going in and then out," she later recalled. "It was just coming in and in and in."
The sea had turned frothy—"like you get on a beer," she said. "It was sort of sizzling."
Any other 10-year-old might have thought it was strange. Tilly knew exactly what it meant.
Just two weeks earlier, in her geography class at Danes Hill School in Surrey, her teacher Andrew Kearney had shown the class black-and-white footage of the 1946 tsunami that devastated Hawaii. He taught them the warning signs: the sea receding unusually far, frothy bubbling water, the ocean behaving in ways it shouldn't.
Tilly was watching those exact warning signs unfold in front of her.
She started screaming at her parents. "There's going to be a tsunami!"
They didn't believe her. They couldn't see any wave. The sky was clear. The beach was calm.
But Tilly wouldn't stop. She became more insistent, more frantic.
"I'm going," she finally said. "I'm definitely going. There is definitely going to be a tsunami."
Her father Colin heard the urgency in her voice. He decided to trust his daughter.
By coincidence, an English-speaking Japanese man nearby overheard Tilly use the word "tsunami." He'd just heard news of an earthquake in Sumatra. "I think your daughter's right," he said.
Colin alerted the hotel staff. They began evacuating the beach immediately.
Tilly's mother Penny was one of the last to leave. She had to sprint as the water began rushing in behind her.
"I ran," Penny recalled, "and then I thought I was going to die."
They made it to the second floor of the hotel with seconds to spare.
Then the wave hit.
It was 30 feet tall.
Everything on the beach—beds, palm trees, debris—was swept into the swimming pool and beyond. "Even if you hadn't drowned," Penny later said, "you would have been hit by something."
The 2004 Indian Ocean tsunami killed over 230,000 people across 14 countries. Entire beaches in Phuket were wiped out. Thousands died.
But at Mai Khao Beach, not a single person was killed.
Because a 10-year-old girl paid attention in geography class.
Tilly was hailed as the "Angel of the Beach." She received the Thomas Gray Special Award from the Marine Society. She was named "Child of the Year" by a French magazine. She appeared at the United Nations and met Bill Clinton.
Her story is now taught in schools around the world as an example of why disaster education matters.
Her father Colin still thinks about what could have happened.
"If she hadn't told us, we would have just kept on walking," he said. "I'm convinced we would have died."
Tilly is now 30 years old. She lives in London and works in yacht chartering.
She still credits her geography teacher, Andrew Kearney.
"If it wasn't for Mr. Kearney," she told the United Nations, "I'd probably be dead and so would my family."
Two weeks. One lesson. One hundred lives.
That's the power of education.

HAWAIIAN ERUPTIONS
03/28/2025

HAWAIIAN ERUPTIONS

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