One of the reasons I decided to attend the New Mexico Institute of Mining and Technology was its proximity to the Very Large Array, which at the time, was the world’s largest and most powerful radio telescope. In my senior year at Tech, I got my dream job, and spent the year working at the VLA. This past weekend, My wife and I took our daughter out to visit my old stomping grounds.
The VLA was an awesome place to work. As you can see from the photo above, the scenery is dramatic. It’s an alto plano in central New Mexico. In fact, the VLA is at higher altitude than Kitt Peak National Observatory where I currently work. I went out to the VLA site every Friday of my senior year to work. What exciting, groundbreaking science did I do with the world’s largest radio telescope? I observed clouds. Yes, clouds on Earth.
Here’s the thing, at the time the National Radio Astronomy Observatory was looking to build something called the Millimeter Array or MMA. Millimeter Array may not sound very spectacular when you’re talking about the Very Large Array, but the name referred to the frequency of light the telescope would observe. My job was to support the site survey work for the MMA. In other words, we were trying to find the very best place in the world to build the MMA. The reason for observing clouds is because while radio waves can travel through clouds, clouds can cause something called phase instability. With a big telescope like the VLA or the MMA, you can have clouds over one part of the array and not the other. The ideal site is phase stable, meaning you don’t get a lot of variation in the cloud cover across the site.
As it turns out, the MMA was never built. Instead, in 1997, the MMA project in the United States joined forces with the European Southern Observatory’s Large Southern Observatory project. The new project was called ALMA, or the Atacama Large Millimeter Array. In 2003, the National Astronomical Observatory of Japan joined the project. So, my work at the VLA observing clouds was an early step in the development of ALMA, which is now on the air. You can read about it here: http://www.almaobservatory.org/en/home/
One fun display they had set up at the VLA now was a radio receiver. This actually was one of the radio receivers used when the VLA received data from NASA’s Voyager spacecraft at Neptune. I actually watched that data come in at the Array Operations Center in Socorro, New Mexico at the time. On our visit, my daughter and I got to use the receiver to detect radio waves from the sun.
As it turns out, the VLA plays an important role in my novel The Solar Sea. The second edition will be released on the first day of spring. You can learn more and preorder it here: https://www.amazon.com/dp/B07BHFS2WV/.