Seasons in the Sun
After the Station fire and flash flooding, astronomer Edward Rhodes and one of his undergrads attempt to make it up Mt. Wilson to the 60-foot solar tower.
Videosmore videos >
Looking into the Sun
USC Astronomy professor, Ed Rhodes, talks about the research he and his team are doing at Mt. Wilson observatory.Video by Mira Zimet
Behind the wheel of his Cadillac SRX, Edward Rhodes slows to a stop at Big Tujunga Canyon Road, where a crew works on asphalt leading to the Mt. Wilson Observatory.
"We'll find out right about here whether they'll let us up the mountain," says Rhodes, professor of astronomy in USC College.
A crewman signals for him to go around the orange cones. Rhodes sighs with relief. After many attempts, he has finally been given clearance to visit the observatory. He hasn’t done so since the Station fire roared through the Angeles National Forest in summer 2009, forcing evacuations, road closures and halting research at the site’s 60-foot solar tower for two months.
After the roads to Mt. Wilson initially reopened, they closed again in the winter after torrential rains and mudslides hit the Southern California burn areas.
“This drive up the mountain used to be lush and green,” says Rhodes surveying the fire-damaged landscape that looks more like a desert than a forest. “There may be a point further along where they won’t let us up.”
A pioneer in the field of solar physics, Rhodes began conducting research at Mt. Wilson’s 60-foot tower in 1977, as a California Institute of Technology postdoctoral student. In 1984, and now a USC professor, Rhodes became the principal investigator of projects at the 60-foot solar tower, where among other things, daily white-light, megapixel images are taken of the sun’s front hemisphere.
The two-month shutdown was the first break in the 25-year data-gathering. The entire observatory was in peril when the largest wildfire in L.A. County history burned through more than 160,000 acres. Flames came close, but did not reach the observatory atop the 5,800 peak in the San Gabriel Mountains. No smoke damage has been detected.
Landmark scientific breakthroughs have occurred at the 102-year-old observatory. It is where astronomer Edwin Hubble discovered there were galaxies beyond the Milky Way in 1925.
Years earlier, scientist George Ellery Hale built a 60-foot tower at Mt. Wilson and in June 1908 used it to become the first to detect the sun’s magnetic fields.
The tower is where Rhodes conducts research with his students, collecting data and studying the sun’s internal structure. A helioseismologist, Rhodes examines the sun’s wave oscillations, similar to how seismologists monitor waves caused by earthquakes to learn about the Earth’s interior.
Rhodes’ group has made its own discoveries. Using the Mt. Wilson Doppler imager, they pinpointed a region of the sun now called the solar subsurface shear layer — a layer just below the sun’s surface where gas moves slower than at mid-latitudes. In a NASA-sponsored project, they are transferring digital images collected since 1988 to USC computer disks, which are being converted to a format widely used in astronomical research exchanges around the world. That data is being archived at Stanford University.
On this foggy day, Rhodes has brought with him Taran Huffman, a physics senior working part-time at the 60-foot tower.
“One of the benefits of going to USC was I knew that it operated a tower on Mt. Wilson,” Huffman says. “It’s been an excellent opportunity for me as an undergraduate.”
At the tower, Rhodes is greeted by Shawn Irish, a USC data analyst and daily operator of the 60-foot tower. While there, the trio examines negatives of the white-light images.
One research goal is to help determine how much of changing solar activity is affecting the Earth’s climate. The sun can help gauge unusual cold snaps and warming, although, Rhodes emphasizes, “only a fraction” of the current warming is due to solar activity changes.
“We want to better predict what influence the changing level of activity in the sun might have on the Earth, not today, but in the future.”
Related News Items
- Ehrenreich and Ralph Earn Sloan Fellowships March 4, 2015
- Just Getting Warmed Up March 3, 2015
- Unlocking Pain Relief February 20, 2015
- On Our Best Behavior February 20, 2015
- Waterman Awarded Prestigious Dan David Prize February 11, 2015
- Better Cures, Better Care February 5, 2015
- Partners in Sustainability and Environmental Studies February 3, 2015
- Diagnosis Success December 4, 2014
- Recognition for Pratt’s Work November 18, 2014
- Small in Stature, Big on Health November 13, 2014
- Mechanics of String Theory November 6, 2014
- Collaboration in 3-D October 28, 2014
- Michelson Center for Convergent Bioscience Ushers in New Era October 23, 2014
- USC Dornsife Recruits Renowned Leaders in Molecular Research October 23, 2014
- Golgi Your Brain October 20, 2014
- In Their Own Words October 8, 2014
- Sugar Linked to Memory Woes October 7, 2014
- Chemists Dispel Long-held Notion September 26, 2014
- In Memoriam: Richard F. Thompson, 84 September 20, 2014
- Converging Science and Engineering September 18, 2014