SUN CORONA WITH HDR TV

The problem is that geomagnetic storms, formed when certain space weather events penetrate our magnetosphere and interact with the atmosphere, can cause massive currents to flow even in electronic circuits that are completely disconnected.Ī key science goal for solar astronomy is to understand how the interplay between the Sun, the space weather that causes these storms, and the effects on Earth itself are all related. If such an event were to occur today, the infrastructure we have for electricity and electronics would experience devastating effects that could easily cause trilions of dollars in damage. Telegraph systems, even when disconnected, experienced their own induced currents, causing shocks and even starting fires. Aurorae were observed around the world: miners awoke in the Rockies newspapers could be read by the aurora's light the bright green curtain appeared in Cuba, Hawaii, Mexico and Colombia. Some 18 hours later (about three to four times the speed of most solar flares), the largest geomagnetic storm in recorded history occurred on Earth. This turned out to be the first-ever observation of what we now call a solar flare. But in 1859, solar astronomer Richard Carrington happened to be looking at the Sun, tracking a large, irregular sunspot, when something unprecedented occurred: a 'white light flare' was observed, intensely bright and moving across the spot itself for around 5 minutes before disappearing entirely. Unfortunately, you can’t just read the packaging-or even rely on how the picture looks in the store.Until 1859, solar astronomy was extremely simple: scientists studied the light from the Sun, the sunspots that occasionally dotted the Sun's surface, and viewed the corona during solar eclipses. Though some TVs carry an Ultra HD Premium logo, indicating that they’ve been certified as high-performance sets by an industry group called the UHD Alliance, not all manufacturers participate in the program. You can’t rely on a TV’s claim of peak brightness, either. Most of those measurements are recorded using a standard industry test pattern, called a 10 percent window, that evaluates the brightness of a small box against a completely black background. But companies can use other methods to produce peak brightness numbers.

SUN CORONA WITH HDR TV

What to do instead? If you’re a CR member, check our TV ratings and buying guide. We have separate scores for UHD picture quality and HDR performance. We measure brightness differently from the testers at most other organizations. You know that 10 percent window pattern? We don’t think it’s a realistic way to determine a TV’s brightness during a regular TV show or movie. That’s why Consumer Reports developed its own brightness test patterns, placing that white 10 percent window against a background of moving video. That gives us a much better idea of the set’s real brightness. If you look through our ratings, you’ll see that the TVs with the best HDR often tend to be the priciest. But there are also some good choices for people who want to spend less. We think HDR performance will continue to be the big differentiator among 4K TVs throughout 2022, but don’t be surprised if more lower-cost sets start to deliver a satisfying HDR experience, too. When you shop for a TV, you may see references to different kinds of HDR. There are several variations on the technology. It can be useful to understand these different HDR flavors, but if it’s more information than you want, don’t worry. TVs with any type of HDR can work well, depending on the specific television model.

Sun corona with hdr