4 ms·
Only insignificantly. Most of the radiation is filtered/diverted by the magnetosphere. The only really practical effect of the disturbance is making the already
by dfox 3y ago
Only insignificantly. Most of the radiation is filtered/diverted by the magnetosphere. The only really practical effect of the disturbance is making the already hard to predict sky-wave propagation of HF even more harder to predict and characterize. Which is today realistically of an interest to HAMs and mostly as an fallback for intelligence agencies and diplomatic services.
Edit: It also somewhat changes the scatter/delay characteristics of GNSS, which may or may not cause a somewhat significant error of the GNSS fix (it probably should not, but it can).
- op00to 3y agoWhat about high frequency trading shops?
- dfox 3y agoThat is completely different definition of HF. And if they use radio (lower latency than fiber, in theory and in right circumstances ), it is somewhere between SHF and EHF (C through V in the IEEE nomenclature), ie. what sane person would informally call “microwave”, not HF.
- jrockway 3y agoThere was a thread on here the other day about HF traders using HF radio.
- tomjakubowski 3y agoYes that's right, also known as shortwave radio. https://spectrum.ieee.org/amp/wall-street-tries-shortwave-radio-to-make-highfrequency-trades-across-the-atlantic-2650277134 https://spectrum.ieee.org/amp/wall-street-tries-shortwave-ra...
- dfox 3y agoWell, the article itself does a pretty good job of describing why it is not an exactly good idea. What it does not say (and what probably nobody suggesting that ever though about) is that the sky-wave propagation mode is either about reflection off the ionosphere or refraction effects of the ionosphere, both of which means that the propagation path is significantly longer and in the refraction case over “slower” medium. The resulting latencies are almost certainly large enough that the whole thing does not make sense even before thinking about the bandwidth and frame sizes.
- jrockway 3y agoAnother thing that got posted here a couple days ago was the Burrito Tunnel: https://idlewords.com/2007/04/the_alameda_weehawken_burrito_tunnel.htm https://idlewords.com/2007/04/the_alameda_weehawken_burrito_... That's where the high-frequency traders should put their fibers ;)
- runlaszlorun 3y agoMan that really had me scratching my head for the first few sentences… haha. The fake link was a nice touch to build credibility. I’m not on my desktop where I can view source, but I’m guessing it’s an href pointing back at its self.
- op00to 3y agoObviously you know more than HFTs which never put thought or engineering into anything. They’re well known dopes who are really bad with technology and money, right?
- deleted 3y ago[deleted]
- op00to 3y ago100% wrong.
- chinchilla2020 3y agoThis is talking about radio wave frequency, not trading frequency.
- macksd 3y agoThe funny thing is that in most ham radio usage, the "high frequency bands" are actually about as low a frequency as most people will ever use. I don't think I've come across anything about low and medium frequencies except in reference materials. People generally use "high frequency", "very high frequency", or "ultra high frequency".
- kube-system 3y agoAM radio is medium frequency. Radio clocks are low frequency.
- runlaszlorun 3y agoI’ve found myself explaining that to people a few times. Lower frequencies are also used to communicate with submarines since they propagate better through water. I’m guessing that when radio first came out frequencies were lower, though I don’t have any facts there. “Shortwave radio” is another one that’s confusing term these days for the same reason.
- tlrobinson 3y agohttps://spectrum.ieee.org/amp/wall-street-tries-shortwave-radio-to-make-highfrequency-trades-across-the-atlantic-2650277134 https://spectrum.ieee.org/amp/wall-street-tries-shortwave-ra...
- amatecha 3y agoYes, in fact at this moment commercial interests are petitioning the FCC to allocate bandwidth in the HF 2-25mhz range for the purpose of high-speed stock trading: http://www.arrl.org/news/commercial-interests-petition-fcc-for-high-power-allocation-on-shortwave-spectrum http://www.arrl.org/news/commercial-interests-petition-fcc-f...
- adhesive_wombat 3y agoThey should be banned anyway. The more we can do to make their operations impossible the better. Their mere existence makes a mockery of the idea of the stock market as a considered reflection of value of companies and explicitly makes it into a gambling den for dead-eyed people competing to have the fastest card counting systems under their suits. If a company is valuable now, it'll be valuable in 5 minutes.
- sgjohnson 3y agoHFTs provide a lot of value to everyone by providing a lot of liquidity and reducing bid/ask spread giving a fairer price to everyone. > If a company is valuable now, it'll be valuable in 5 minutes. That’s not necessarily true.
- DiscourseFan 3y agoIt just so happens that those who advocate and benefit directly from it are the ones who already have the power to make markets. The product of a company is based on its labor utilization, which doesn't change materially in the (very) short timespans of HFT. Liquidity aside, five minutes isn't going to make much of a difference when most people generally wait weeks or months to make major asset purchases like a car or a house, or to be approved for a small business loan. Only the ultra-wealthy car about milliseconds, because they can afford to make such vast and diverse trades in so little time.
- falcor84 3y agoLabor utilization is only one piece of a very big puzzle. Other pieces that change more quickly include commodity and supply chain costs, competitor activities, technological advances, and many other factors, all of which can change quite quickly in our globalized world.
- adhesive_wombat 3y ago"Quite quickly" and "so quickly that a basement full of racks of FPGAs, point-to-point radios, transcontinental fibre runs and optical switches are required to extract our value" are maybe not exactly the same thing.