Public Outreach

UPDATE (2017 Aug 2) – I’ve had more than person ask whether they’ll be able to see the solar corona, the tenuous and very hot outermost layer of the Sun’s atmosphere, during the partial eclipse in Boise. I believe the answer is no.

This website indicates that the corona is a million times dimmer than the Sun’s photosphere. During the darkest part of the partial eclipse in Boise, the photosphere, the part of the Sun we usually see, will be 200,000 times dimmer than usual (see below).

So my guess is, from Boise, not enough of the photosphere will be occulted to reveal the corona.

Millions of people will travel from around the world to observe the total solar eclipse on August 21 in the path of totality, a band extending across the US in which the Moon will completely occult the Sun. Everyone NOT inside that path will observe a partial solar eclipse, and the closer you are to the path of totality, the darker your partial eclipse.

During our statewide tour talking about the eclipse, I have been asked again and again “Is it worthwhile trying to get to the path of totality?” The honest truth is that there are some aspects of the eclipse that you will miss out on if you don’t get to the path of totality.

BUT getting to the path of totality can be difficult – in Idaho, there are reports that all hotels and campsites are booked up, and driving to the path on the day of the eclipse will probably involve sitting in traffic for many hours. So travelers should be prepared with food and water.

So what will you see if you CAN’T get to the path? You can still enjoy a nice eclipse, but you MUST use eye protection during the ENTIRE eclipse. Staring at a partial eclipse at any level can permanently damage your eyes.

Eclipse shades, the best way to safely observe the solar eclipse.

What will you see during a partial eclipse? That depends on where you observe from. For example, Boise is just south of totality and will see a partial eclipse with 99.555% obscuration (check out this amazing map to see eclipse conditions anywhere in the world). That means the Moon will block all but 0.00445% of the Sun’s disk, making the Sun more than 200,000 times darker than usual.

So what will that look like? The visualization below shows an approximation as seen through eclipse shades. As one-two-hundredth its normal brightness, the Sun will appear a little dimmer than the sky at twilight* and about ten times as bright as the Sun normally appears from Pluto.

What a 99% partial eclipse looks like through eclipse shades. From http://americaneclipseusa.com/seeing-the-eclipse-from-home/.

At this level, though, you probably won’t be able to see the solar corona, and other eclipse effects will be substantially more muted. But for those who can’t take off of work or skip school – August 21 is a Monday, after all – the partial eclipse viewed from near the path of totality will still be a once-in-a-lifetime event.


*At 0.00445%, the usual solar flux (1300 W/m^2) will be reduced to about 0.06 W/m^2. This paper indicates that when the Sun is at a zenith angle of 105 degrees (i.e. a while after the Sun has set), the sky brightness is about 0.1 W/m^2.

Along with my student Karan Davis, I enjoyed a visit last night to the town of Cambridge, about a two hours north of Boise, to talk to folks there about the August 21st solar eclipse.

We were invited by Nina Hawkins, one of the librarians at the public library there in town, and we met her before the presentation at the newly refurbished Country Coffee Cabin in Midvale.

A BLT and fingersteak basket later, Nina led us up the nine-mile winding road to Cambridge, where we were greeted by a few dozen Cantabrigians at the library. For about an hour, Karan and I described the upcoming event and answered questions from the public. As always, I was impressed by how engaged and interested everyone was, especially late on a Thursday evening.

After passing out eclipse shades to the attendees, we packed up our road show and drove back down to Boise, just as the Sun set in the cloud-strewn pink sky, a preview of the twilight effect we will experience during the eclipse in August.

The presentation I gave in Cambridge is posted below.


Sunset over Idaho Falls.

Just returned from my trip to Idaho Falls, speaking to hundreds of locals about the upcoming eclipse.

I was invited to give two presentations at the Idaho Falls Public Library, a library so beautiful and spacious it has an atrium with a fountain.

On Tuesday evening, I gave a presentation to the broader Idaho Falls community. A few minutes before the presentation, there were only about a dozen attendees, which made me a little nervous, but by the appointed hour, the space had filled beyond capacity, with nearly one hundred folks – an unexpected large but very welcome crowd.

Before my next presentation on Wednesday afternoon, I took a side trip up to the St. Anthony dune field. Since the dune field is likely to be a prime spot for eclipse-viewing, I was curious to see what preparations they were making.

The dune field near St. Anthony.

Back to Idaho Falls for an afternoon presentation geared to the youngest eclipse enthusiasts. Here again, we had an unexpectedly large crowd, with easily 200 kids and parents cheerfully crammed into the presentation space.

Wednesday’s crowd.

After helping the kids make souvenir planispheres, I packed up my roadshow for the long drive back to Boise. The megaflood-carved landscape of the Snake River Plain combined with a Planet Money podcast about a flatware-crafting commune to make the time pass quickly.

The presentations I gave in Idaho Falls are posted below.


Idaho Falls Community Presentation

Idaho Falls Children’s Presentation

UPDATE: The stargazing event today went swimmingly – several dozen visitors came down to talk about the solar eclipse and look at the Sun. We even had crew from KTVB film some interviews. Some photos from our event below.


Join the Boise State Physics Department and learn more about the Aug 21 solar eclipse. We will host a conversation about observing the eclipse and distribute eclipse shades.

The event will take place on Sunday, June 18 from 12p till 2p in the plaza just north of the Multipurpose Classroom Building on Boise State’s campus.

Questions can be sent to Prof. Brian Jackson via e-mail – bjackson@boisestate.edu.

Asking questions at a scientific conference is one of the most exciting but intimidating aspects of conference attendance. Here, I give a few suggestions (write down your questions, introduce yourself, etc.) to ease the process.


Annual scientific conferences are one of the highlights of working in astronomy – you get to visit a new place, you get to meet with old friends, and you get to hear about scientific results so cutting-edge they can change from hour to hour. Optimizing the conference experience requires a fair amount of planning, but fortunately, there are a number of online guides explaining how to plan your conference, how to prepare an oral presentation, how to make a poster, etc.

At the end of most presentations, the audience is invited to ask questions, and these question-and-answer sessions can lead to some of the most exciting, interesting, and dramatic developments at a conference. These exchanges can also be very important forums for feedback and can give a budding scientist a chance to make connections to the broader community.

But asking a question in front of a big crowd can be a little daunting, and unfortunately, there doesn’t seem to be any advice online about how to do it. (UPDATE: After writing this blog post, I found this discussion that echoes some of my points.)

So I thought it would be helpful to collect a few thoughts on the topic. These ideas are by no means exhaustive and may not be widely agreed upon, so if anyone has suggestions, please don’t hesitate to let me know.

Here we go:

1. Don’t feel bad for feeling nervous – One of my colleagues once told me she felt so nervous walking up to the mic to ask questions that she thought her voice would crack. That made me feel a lot better about my own intestinal lepidoptera. Most people get anxious when speaking in front of hundreds of the smartest people in the world, so don’t stress about feeling that way.

If you anticipate wanting to ask a question, though, you can sit close to the mic at the beginning of the presentation to shorten the walk.

2. Write down your question – I tend to take short notes during presentations, usually about things to ask the speaker after the presentation or even in an e-mail after the conference. But it’s very helpful to already know what you want to say before getting to the mic, so not a bad idea to write it down.

3. Introduce yourself – Several times after one of my presentations, someone has asked an interesting question or made a good point that I wanted to follow up on afterward. However, after asking their question, the person melted back into the crowd to remain anonymous forever. So it’s very helpful if you give your name and affiliation before asking your question. Keep in mind that the speaker may be staring into bright lights and not able to see the audience.

I also think it’s just common courtesy to introduce yourself, and if, as a community, we encourage questioners not to remain anonymous, we will reduce the temptation to attack the speaker.

4. Keep it short, and don’t get hung up on a minor point – A good anecdote from this website shows what I mean here: “I … gave my talk and the Q&A followed, then a questioner began a diatribe that lasted at least 20 minutes: in fact, it was a mini-lecture. At first I thought I heard a question begin to emerge, but it disappeared – after that the ‘lecture’ was in full flow. … Finally the chair [of the session] rose to stop him by thanking him and saying it was halfway through lunch, to much relief.”

If you have a lot to say or would like to address a very narrow, technical point in the presentation, it’s probably best to wait until after the session to talk to the speaker. Remember that the presenter is not the only person to whom you are speaking. I think it’s best to focus on questions of general interest, not just to the one or two people who specialize in, for instance, tidal dissipation parameters. Of course, this is a scientific conference where the audience is full of specialists, so there’s a balance to strike here.

Also, at most conferences, there are only a few minutes for questions, so keeping your question short leaves time for others.

5. Don’t ambush the speaker – Once, early in my grad career, a very preeminent astronomer introduced himself at breakfast and expressed a big concern about some recent work I’d done. It was a very good point, and, at the time, I said I didn’t have an answer but would get back to him. After I gave my talk later that afternoon, this astronomer raised the same question, publicly suggesting to hundreds of others that my results were probably wrong. Of course, I still didn’t have an answer for him. (As it turned out, he was wrong, and we responded to those concerns in a few subsequent papers.)

The point of the story is not to complain but to say that it’s not helpful to attack a speaker publicly since it can be hard for someone to come up with a thoughtful response on the spot. I think it’s much more effective (and more polite) to raise such concerns privately (at least at first), perhaps one-on-one or via e-mail. Then, if the presenter refuses to respond or obfuscates, maybe it makes sense to raise your concerns in a public forum so the community is aware of the problem.

6. When in doubt, save it for the post-session – In the end, you almost always have a chance to talk with the speaker later. So if you’re hesitant to ask during the question session, approach the speaker afterward.

It’s true that there are some jerks in the scientific community, but the vast majority of scientists I’ve met are considerate and thoughtful. And even most jerks love it when someone has taken enough interest in their work to ask questions.

If you’re uncomfortable approaching someone you don’t know, reach out to your colleagues at the conference to see if anyone knows the speaker. And then, of course, e-mailing the question is always possible. Another good reason to write it down.

A quick visit last night to a city council meeting in Payette, just about an hour northeast of Boise. I gave a short presentation about the eclipse (below) and helped answer questions for the council and city residents, along with reps from Idaho’s Board of Tourism and Emergency Management.

One particular concern for Payette is traffic on the day of the eclipse. Lots of folks are expected to fly into Boise and the surrounding area for the eclipse and then drive up to the path of totality, which will take many of them along Hwy 95 and through Payette. City fire and police reps are trying hard to plan for any eventuality and seemed well aware of the unprecedented event headed their way.

Unfortunately, I was only in town for a few hours, so not any time to poke around. Maybe next time.


Over the Memorial Day weekend, we hosted a workshop for volunteers with the Citizen CATE Project, an ambitious citizen-science project to make a 90-min long movie of totality during the solar eclipse on August 21.

For the August eclipse, it only takes about 2-min for the Moon’s shadow to pass over anyone point on the surface of the Earth – after all, it’s traveling about 1,000 miles per hour.

But the Citizen CATE project aims to extend the duration of totality by outfitting sites all along the eclipse track with telescopes, cameras, Arduinos, etc.

That way, as the Moon’s shadow passes from west to east across the US, from one site to the next, the images can be cut together to produce a totality that lasts much longer than that at any one site. The resulting movie will quickly be uploaded to the internet and made available to eclipse-lovers the world over.

Such citizen science projects go back at least to 1715, when the preeminent Edmund Halley, of cometary fame, predicted the apparition of a solar eclipse to a precision of four minutes. He enlisted the aid of his fellow citizens to record the eclipse duration at more than a dozen locations throughout the British Isles. Compiling these data, he was able to significantly improve the Moon’s ephemeris and make much more accurate future predictions.

And so on Sunday, May 28, the Physics Dept at Boise State invited groups from sites across Idaho to campus for a training workshop hosted by Citizen CATE. The day was hot and sunny – perfect for sunburns and sungazing – and I’ve posted photos from our work below.