Solar Definition and 1000 Threads

Total Solar Energy Rejected (TSER) = The percentage of total solar energy rejected by filmed glass. The higher this value, the less solar heat is transmitted. Here is something puzzling. I bought two tints to try on windows. The lower one on the left (NR Smoke 20) has Total Solar Energy...

I want to put solar panels on top of my RV, getting the panels to move in order to track the sun make them nearly 40% more efficient than being static. I have worked out the electronics to control the motors to move the panels by programming an arduino board with light sensors etc but I need...

From my understanding, for an observer to see a total solar eclipse, 1) the Moon's orbit has to be near aligned with the Earth's Orbit, 2)such that the New moon's Umbra falls on Earth, and 3) the observer must be within this cast umbra. But for a partial solar eclipse, since the Penumbra of the...

I am building a planet that will orbit a sun and I need help My world has 11 planes/asteroids. the planet Le Bear has multiple life forms on it. It takes 378 days to rotate around the sun. My planet has a circumference of 8199.49 miles. there are 12 months of 28 days and then 1 1/2 months of...

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I visited a friend who has a very nice solar installation. He also has the software to do data collection and presentation. I thought it would be nice to share some of his data here. Perhaps we can link to this post as a reference in future solar discussions. First, some background. The...

Hello All, This is my first post on this forum and I am here because I need help with an idea that I have. I am thinking of a pressurized vessel with two unidirectional valves. One for water intake, and another for steam release. The vessel will have a small sealed borosilicate glass “window”...

Hydroelectric power, effected usually by damming a river, is ordinary considered an example of energy produced by gravitational potential. However, from an ultimate perspective, hydro power is actually an example of solar power. Water must drop to a lower gravitational potential to extract...

Although I have over the years seen reports about simulations of the the Earth's moon's origin by a variety of possible mechanisms, none of these reports have ever reported the probability of such events. What is a reasonable estimate of the fraction of solar systems that have a planet of a size...

While The martian written by Andy Weir is a really hard stuff, but the effects of the storm at the beginning arent. But i wonder could a real solar/sandstorm actually help a prison break on Mars (from a remote penal colony)? Could it mask tracks in the dust? Could it create enough interference...

The solar constant is only on one side of the Earth, however it moves around and the Sun gives out it's energy/heat all over the Earth in 24 hours. And the seas and land have heated up over time. However I got told this, No its not. By definition the solar constant is referring to a 2...

Hi. I am studying the effect of plasmonic nanoparticles on solar cells. Is there a way to calculate absorption efficiency in different layers of tandem solar cells in COMSOL Multiphysics.

Hi all, I am working on perovskite solar cell related studies. J-V curve (current density-voltage curve) is one of the important measurements to determine the performance of the device. In practice, we perform the reverse scan first then then followed by the forward scan. There is usually a...

Does direct radiation increase as the zenith increases? I know the diffuse radiation increases as zenith does, but is it the same for direct Also is it right to say that when diffuse radiation increase, the direct should decrease and vice versa? edit: My book says diffuse increases as we...

Summary: Looking for input on either floating or sinking a large sheet of dark screen for solar absorption in a pool Looking for input on either floating or sinking a large sheet of dark screen for solar heat absorption in a pool. My though its that screen would be very user friendly to roll...

Suppose there is a 1 million solar mass black hole. A 1.022MeV photon near a nucleus produces an electron-positron pair a distance=A from the event horizon. The positron’s vector is directly “up” away from the singularity. It doesn’t have escape velocity. It reaches an apogee at distance=B from...

So Juno is on her downhill run towards Jupiter. Only doing about 8k right now, but by the time she rounds Jupiter she'll be doing 100k or more. We are going to get so much science from Juno. Personally I am eagerly awaiting the results of what Jupiter looks like under all those clouds.

I've recently been interested in how much energy the Earth intercepts from the Sun; the answer, unsurprisingly was an astronomical amount, measuring quite easily into the ZetaWatts. However, the maths that got me that answer got me thinking... you can use the same method to determine the amount...

[Moderator Note: This subtopic split off from https://www.physicsforums.com/threads/renewable-energy-meets-power-grid-operations-comments.970843/] This is more so a problem for solar PV. Some of the recent solar thermal + molten salt storage systems would not suffer from this problem. eg...

If one hooks up solar panel to bottom element after removing AC line seemed like good idea then I was wondering if the wires going to the element will get hot instead of the element see drawing.

Here, i have provided the description of the mean molecular weight from my course notes as well as my workings. I'm not sure about my values for X and Y. It states that X=1 if all of the hydrogen is ionised which i think the 1 represents 100% hydrogen but the core is also made up...

This is my understanding.

I see that South America (Chile/Argentina) will be getting a total solar eclipse this winter (i.e., winter there) and then another one only 17 months later that seems to be along the same type of path, albeit a little bit south. This can't be very common...

I have solar radiation data in the units of Joule per cm^2 (joule per square centimeter) measured hourly. I want to use this data in evapotranspiratin calculation which requires radiation units as Watt per meter squared. How can I do this conversion?

Since solar and wind power are fluctuating energy sources not all of it goes into the grid when the consumer power demand is lower than that actually produced. This is a well-known drawback of solar and wind energy that everyone talks about. What I never found is an assessment of how much of the...

Hello! I'm in the early process of brainstorming plans for a roof mounted mobile solar array as a DIY project. The host vehicle will be a 8.5'x20' cargo trailer. On the roof I can fit an array of 6x solar panels that is almost exactly 8.5x20. However, I actually want to create 3 such arrays...

If the distribution of elements in the universe is also the distribution of elements in the solar system for regular matter, and being dark matter so overwhelmingly prevalent in the universe, why can't we see it overwhelmingly in the solar system?

Had not seen much discussion of this, but of course PV cells are semiconductors with a finite life and will have to be disposed of within a decade or two https://www.scmp.com/news/china/society/article/2104162/chinas-ageing-solar-panels-are-going-be-big-environmental-problem

I am currently trying to solve a problem for my dissertation. Help would be greatly appreciated. :) A silicon solar panel of area 1m^2 is being warmed by the sun. It achieves a constant temperature of 80 degrees celcius. I am trying to cool this panel which is constantly being provided solar...

P. O’Hare et al. Multiradionuclide evidence for an extreme solar proton event around 2,610 B.P. https://www.pnas.org/content/early/2019/03/05/1815725116 https://www.sciencenews.org/article/one-strongest-known-solar-storms-blasted-earth-660-bc Extreme solar events, proton events, are not common...

Soooo, hi PF, it's been a long time since I needed your help, but here I am again. I've been doing some worldbulding lately and I came up with this idea of a world in which civilisation and life are much, much older than in ours. Yet it isn't as developed due to some kind of natural disaster...

Can the suns photons accelerate the plasma/solar wind away from the sun? or is there no interaction between them?

Hello everyone, For villages in Africa and Asia that still use wood, dung or other biomass in simple stoves which option do you think will be better? Concentrate solar energy into an insulated unit with a molten salt which can then be used at any time or build a simple biogas generator (large...

What solutions are there to feeding a high DC voltage rated (eg 1000VDC) certified grid tied solar inverter such as a Yaskawa Solectria PVI23-480; from an alternate DC+ bus supply. For instance the 670 VDC input from a solar string; might be replaced by a a 6 pulse rectifier; (possibly from a...

Hello all, I am in deep water here based on my very fundamental understanding of physics generally and solar design specifically. I am 83 years, homeless, and have access to land with one building, wood heat, non-potable site water, and nothing else. I want to make a PV system with an array...

I have two questions (1) If we have two areas, for example one in America and the other on Asia, both with the same latitude φ, which one of the areas will receive more Solar Radiation? Or will it be the same? (2) If Earth's eccentricity graph for the past 750k years is this...

I have been looking at various solar power dish designs. They have one thing in common, they all have their power generators located at the focal point. Why don't any of the designs use a secondary mirror located at the focal point and the generator located center of dish and right behind it...

Hello everyone,I am trying to acquire the data used to make solar images like in this link. For various wavelengths, but mainly for visible. And, honestly I am having a problem finding the data. I am assuming that these images are made using a set of data for each, am I wrong? I don't have a...

I am the captain of a high school solar car team in the Washington DC area. We were founded last year, and are currently building our second solar car to compete in the Solar Car Challenge, a national competition in Texas. One of the biggest issues we are constantly battling is our lack of...

For a photon passing close to the Sun, Newtonian physics predicts a deflection of 0.85o. GR gives the correct 1.7o. Can the true value alternatively be obtained via 1) a Newtonian model, and 2) gravitational time dilation: the photon's slower speed near the Sun leads to it spending more time in...

Does our solar system host a Ninth planet, If so has our solar system under gone planetary migration?

Homework Statement I have a project to make the Solar system on Python, which I have done, but they also require from us to calculate the total energy of the system. We don't have to make the orbits of the planets elliptical, they should be circular and I believe I made them like that. Since...

Hi, I'm new here. I have a doubt regarding solar radiation, I heard in an astronomy class on the use of this solar radiation for the stabilization of satellites in orbit due to mechanical problems with their stabilizers. Electromagnetic waves emitted through solar radiation stabilize such a...

Why is solar spectral intensity per wavelength different than solar spectral intensity per frequency?

I have a project to make the solar system. I am trying to start from somwhere. On the notes it says that we need to start by creating a System of Particles Two-body simulation (Circular motion) Implement Gravitational acceleration Each particle (planet) could have its own field. I.e. Each...

Homework Statement Imagine two planets orbiting a star with orbits edge-on to the Earth. The peak Doppler shift for each 70 m/s, but one has a period of 7 days and the other has a period of 700 days. The star has a mass of one solar mass. (Assume 1 solar mass equals 2E+30 kg.) Q1: Calculate...

Hello. My name is John. I have an undergraduate degree in Mathematics. I am now classified as a senior citizen. I have always been interested in science. I've been following the progress of NASA's Parker Solar Probe and in the latest blog, Geoff Brown of Johns Hopkins University Applied Physics...

greeting all Over the last 2 weeks I have noted the first sunspots of the new solar cycle 25. How do I know they are spots of the new cycle ? Because they are higher latitude and opposite magnetic polarity. Before I show an image, a little history and science. Over the many observed solar...

Hi, Does anyone know of a way I can model the output of a solar still with a specific tilt angle and location (Africa) to give me my desired output value? I've been looking at lots of research papers but the maths is far too confusing for me to even begin to try work it out and I'm hoping there...

Solar generation results for US are out for 2017. Year over year: http://www.eia.gov/electricity/annual/html/epa_01_02.html https://www.eia.gov/electricity/annual/pdf/epa.pdf US: Net Generation (Thousand Megawatthours) 2014 Solar: 17691 (that's 0.43%) All sources: 4093606 US: Net Generation...