Was anyone logging the eastern US power grid today during the eclipse? I've got some pretty simple hardware at home and about 50 miles away at work. Both are showing a bit of weirdness today around 19:00 UTC. I'd be curious to see if anyone else sees the same. (I'll email and ask the UTK power grid group tomorrow.) These are simple low resolution graphs plotted by munin on 5 minute intervals. The logs have far more sample points, but I'll have to find time to run gnuplot over them for more details. Accumulated error in cycles (note dip around 19:00 UTC): https://www.n5tnl.com/time/eclipse_2024/line_cycles-day.png Frequency averaged over 1 hour: https://www.n5tnl.com/time/eclipse_2024/line_freq_1h-day.png -- newell N5TNL

I have a monitor at my home in California. It is monitored by a university in Kentucky. They watch the frequency nationwide. I can ask them if they saw anything strange during the eclipse. I also have a Ting monitor that reports to me weekly. It looks for voltage spikes, dropouts, etc. I’ll see what the next report looks like. Jeremy On Mon, Apr 8, 2024 at 8:47 PM Scott Newell via time-nuts < time-nuts@lists.febo.com> wrote: > Was anyone logging the eastern US power grid today during the > eclipse? I've got some pretty simple hardware at home and about 50 > miles away at work. Both are showing a bit of weirdness today around > 19:00 UTC. I'd be curious to see if anyone else sees the same. (I'll > email and ask the UTK power grid group tomorrow.) > > These are simple low resolution graphs plotted by munin on 5 minute > intervals. The logs have far more sample points, but I'll have to > find time to run gnuplot over them for more details. > > Accumulated error in cycles (note dip around 19:00 UTC): > https://www.n5tnl.com/time/eclipse_2024/line_cycles-day.png > > Frequency averaged over 1 hour: > https://www.n5tnl.com/time/eclipse_2024/line_freq_1h-day.png > > > -- > newell N5TNL > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com >

I do see the same here in CA: https://github.com/will127534/RaspberryPiAtomicNixieClock/assets/6110733/988c5938-0da5-4e77-88c8-934de2390b42 The time scale is in UTC What might be the cause? Jeremy Nichols via time-nuts <time-nuts@lists.febo.com> 於 2024年4月9日 週二 上午4:49寫道： > I have a monitor at my home in California. It is monitored by a university > in Kentucky. They watch the frequency nationwide. I can ask them if they > saw anything strange during the eclipse. > > I also have a Ting monitor that reports to me weekly. It looks for voltage > spikes, dropouts, etc. I’ll see what the next report looks like. > > Jeremy > > > On Mon, Apr 8, 2024 at 8:47 PM Scott Newell via time-nuts < > time-nuts@lists.febo.com> wrote: > > > Was anyone logging the eastern US power grid today during the > > eclipse? I've got some pretty simple hardware at home and about 50 > > miles away at work. Both are showing a bit of weirdness today around > > 19:00 UTC. I'd be curious to see if anyone else sees the same. (I'll > > email and ask the UTK power grid group tomorrow.) > > > > These are simple low resolution graphs plotted by munin on 5 minute > > intervals. The logs have far more sample points, but I'll have to > > find time to run gnuplot over them for more details. > > > > Accumulated error in cycles (note dip around 19:00 UTC): > > https://www.n5tnl.com/time/eclipse_2024/line_cycles-day.png > > > > Frequency averaged over 1 hour: > > https://www.n5tnl.com/time/eclipse_2024/line_freq_1h-day.png > > > > > > -- > > newell N5TNL > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe send an email to time-nuts-leave@lists.febo.com > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com

> On 10 Apr 2024, at 08:57, willl will via time-nuts <time-nuts@lists.febo.com> wrote: > > What might be the cause? Automated systems and humans reacting to the change in light level. Suddenly it gets very dark in the house. Even if you are completely ignoring the spectacle outside you and your porch light will react to the situation. Regards, -- Ruben

PV generators? On Wed, Apr 10, 2024 at 8:56 AM willl will via time-nuts < time-nuts@lists.febo.com> wrote: > I do see the same here in CA: > > https://github.com/will127534/RaspberryPiAtomicNixieClock/assets/6110733/988c5938-0da5-4e77-88c8-934de2390b42 > The time scale is in UTC > > What might be the cause? > > Jeremy Nichols via time-nuts <time-nuts@lists.febo.com> 於 2024年4月9日 週二 > 上午4:49寫道： > > > I have a monitor at my home in California. It is monitored by a > university > > in Kentucky. They watch the frequency nationwide. I can ask them if they > > saw anything strange during the eclipse. > > > > I also have a Ting monitor that reports to me weekly. It looks for > voltage > > spikes, dropouts, etc. I’ll see what the next report looks like. > > > > Jeremy > > > > > > On Mon, Apr 8, 2024 at 8:47 PM Scott Newell via time-nuts < > > time-nuts@lists.febo.com> wrote: > > > > > Was anyone logging the eastern US power grid today during the > > > eclipse? I've got some pretty simple hardware at home and about 50 > > > miles away at work. Both are showing a bit of weirdness today around > > > 19:00 UTC. I'd be curious to see if anyone else sees the same. (I'll > > > email and ask the UTK power grid group tomorrow.) > > > > > > These are simple low resolution graphs plotted by munin on 5 minute > > > intervals. The logs have far more sample points, but I'll have to > > > find time to run gnuplot over them for more details. > > > > > > Accumulated error in cycles (note dip around 19:00 UTC): > > > https://www.n5tnl.com/time/eclipse_2024/line_cycles-day.png > > > > > > Frequency averaged over 1 hour: > > > https://www.n5tnl.com/time/eclipse_2024/line_freq_1h-day.png > > > > > > > > > -- > > > newell N5TNL > > > _______________________________________________ > > > time-nuts mailing list -- time-nuts@lists.febo.com > > > To unsubscribe send an email to time-nuts-leave@lists.febo.com > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe send an email to time-nuts-leave@lists.febo.com > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com

On Monday, April 8, 2024 9:23:47 PM CDT Scott Newell via time-nuts wrote: > Was anyone logging the eastern US power grid today during the > eclipse? I've got some pretty simple hardware at home and about 50 > miles away at work. Both are showing a bit of weirdness today around > 19:00 UTC. I have no idea how much power disruption would be needed to cause that amount of change in the power distribution, but I see that there is a few MW of solar generation in that general quadrant of the state. I don't know if the shadow traversing the solar generation plants could explain the behavior, but would probably be the first easy answer I would look for. -- Chris Caudle

Does anyone know the size of the Moon’s shadow on the Earth? From satellite views, I get the feeling it could be the size of one or more US a states. That would knock out a lot of solar production and cause a lot of nightlights to illuminate. Jeremy On Wed, Apr 10, 2024 at 7:14 AM Chris Caudle via time-nuts < time-nuts@lists.febo.com> wrote: > On Monday, April 8, 2024 9:23:47 PM CDT Scott Newell via time-nuts wrote: > > Was anyone logging the eastern US power grid today during the > > eclipse? I've got some pretty simple hardware at home and about 50 > > miles away at work. Both are showing a bit of weirdness today around > > 19:00 UTC. > > I have no idea how much power disruption would be needed to cause that > amount > of change in the power distribution, but I see that there is a few MW of > solar > generation in that general quadrant of the state. I don't know if the > shadow > traversing the solar generation plants could explain the behavior, but > would > probably be the first easy answer I would look for. > > -- > Chris Caudle > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com >

The change in load on the grid was fairly unusual during the eclipse with rapid changes in the bulk power system. See the graph linked below from grid operator ISO New England. Y axis is megawatts of demand, while the x axis is Eastern Daylight time. Both days were sunny, but we see the dramatic effect of the moon's shadow reducing the amount solar generation on the afternoon of the 8th. https://bhows.org/New_England_grid_eclipse.png It is not too surprising (to me anyway) that the grid frequency wandered around a bit during this unusual load swing. -Joe

Hi There are maps that show the path of the eclipse and how long a given point was “in the dark”. Typical numbers for full darkness at center of path came in around 3 to 4 minutes. From the center, you could see the “light edges” of the zone of darkness in all directions. Light started to drop a bit before it went completely dark, but that was nowhere near the change that the full on total eclipse created. One of *many* sites with information: https://eclipsophile.com/2024tse/ Bob > On Apr 10, 2024, at 11:12 AM, Jeremy Nichols via time-nuts <time-nuts@lists.febo.com> wrote: > > Does anyone know the size of the Moon’s shadow on the Earth? From satellite > views, I get the feeling it could be the size of one or more US a states. > That would knock out a lot of solar production and cause a lot of > nightlights to illuminate. > > Jeremy > > > On Wed, Apr 10, 2024 at 7:14 AM Chris Caudle via time-nuts < > time-nuts@lists.febo.com> wrote: > >> On Monday, April 8, 2024 9:23:47 PM CDT Scott Newell via time-nuts wrote: >>> Was anyone logging the eastern US power grid today during the >>> eclipse? I've got some pretty simple hardware at home and about 50 >>> miles away at work. Both are showing a bit of weirdness today around >>> 19:00 UTC. >> >> I have no idea how much power disruption would be needed to cause that >> amount >> of change in the power distribution, but I see that there is a few MW of >> solar >> generation in that general quadrant of the state. I don't know if the >> shadow >> traversing the solar generation plants could explain the behavior, but >> would >> probably be the first easy answer I would look for. >> >> -- >> Chris Caudle >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe send an email to time-nuts-leave@lists.febo.com >> > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com

Is the street lighting in that part of the world automatic like here down under? Did a whole bunch of street lighting sensors all detect dark at the same time and turn the street lights on? Nic Near Sydney Australia. -----Original Message----- From: Joseph B. Fitzgerald via time-nuts <time-nuts@lists.febo.com> Sent: Thursday, April 11, 2024 1:13 AM To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> Cc: Joseph B. Fitzgerald <jfitzgerald@alum.wpi.edu> Subject: [time-nuts] Re: Power grid logging during the eclipse? The change in load on the grid was fairly unusual during the eclipse with rapid changes in the bulk power system. See the graph linked below from grid operator ISO New England. Y axis is megawatts of demand, while the x axis is Eastern Daylight time. Both days were sunny, but we see the dramatic effect of the moon's shadow reducing the amount solar generation on the afternoon of the 8th. https://bhows.org/New_England_grid_eclipse.png It is not too surprising (to me anyway) that the grid frequency wandered around a bit during this unusual load swing. -Joe _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-leave@lists.febo.com