Solar Definition and 1000 Threads

If there is a charge separation on macroscale in a solar cells (electrons flow in one direction and holes in another) why there is no high voltage build up similar to capacitors or piezoelectrics where also charge separation occur? There exist some glasses which become conducting when heated...

I'm working on a solar radiation project. I was able to design a homemade pyranometer, yet I'm trying to establish what the sample rate should be. After reading several pdfs I set 60 seconds as my sample rate and I have good results, I mean if I choose 10 seconds instead I just get a lot of...

Since the Earth's magnetic field helps to protect the Earth from a lot of the suns harsh treatments, do we also assume that in some degree light is also (possibly in very small fractions) also diverted by the magnetic field? If no, would it even be possible to assume that a very strong...

Hey guys, I am a complete beginner in the field of electrical engineering so please bare with me in this discussion. It is my understanding that; 1) The Earth absorbs 3,850,000 exajoules in solar energy every year, which means that if we could harness even 50% of the suns power for just one...

And goes directly through Oregon. Woohoo! http://eclipse.gsfc.nasa.gov/SEgoogle/SEgoogle2001/SE2017Aug21Tgoogle.html

Is it just because the moon moves in and out of view quicker than the Earth moving in and out of view as to a lunar eclipse? I can't find a simpe definition out there? Thanks!

The question I have is: Assume a 100 kg reflective load with 1m2 area at a distance of 1 million kilometers from the surface of the sun. If the sun’s temperature is 6000K and radius is 695,000 km, find the radiation pressure exerted on the object. Find how far the load would be from its...

Homework Statement 1m wide solar heat collector that is x long. Find the temperature as a function of x. 500 W/m^2 transferred from the collector to the air within the collector, 100%. Air enters the collector has the following properties: cp = 1000 J/(kg*K) m = 0.02 kg/s...

I was perusing an astronomy homework site and came across a question in which they are asked to plot the positions of the 3 inner planets on polar graph paper. They are then asked questions about visibility and time of day in Earth's sky. The table: Location Venus Earth Mars 1 280...

http://www.politico.com/news/stories/1010/43156.html#ixzz11VnCzznc I wasn't sure if this discussion might go nowhere, political, or towards energy, so GD is it for now. While I didn't like Carter as a leader, he had the right ideas. I don't know if the original system made sense or not...

Hi Guys I m thinking of making a Solar air compressor ie heating air in a closed vessel ( constant volume heat addition) using parabolic reflectors etc till reaches an optimum pressure At this point a check value opens, and the the pressurised air is made to pass through a heat exchanger (...

(I would've put this in the homework section except it didn't follow the template.. :P I'm really sorry) For a Science Fair project I want to make a portable energy source with solar panels. I'm thinking of making a cube of panels with the deep cycle battery within the cube. Then to make it...

I have been asked to estimate the thermal load (in Watts) of a small, commercial aircraft (ie, King Air B300, B350) sitting on a tarmac on a hot day due to solar irradiance. The solar irradiance specified is 1120 W/m^2, the total surface area of the fuselage is about 52.93 m^2, and the...

So I'm not the most knowledgeable person when it comes to electrical connections and the like but I tend to have a fair idea. I'm currently planning on building a solar panel with the hope that it will power appliances throughout my house. My planned set up is as follows: >> 36 0.5V 3.6A...

Fabrication of Single Junction GaAs Solar Cell by MBE Hi All, My project is to produce 1 single piece of GaAs solar cell (about the size of 1cm square) by MBE technique. I have gone through some read up and simulation software software called atlas by silvaco. for time being, I am testing on...

Homework Statement We wish to size a flat plate collector to provide water for one hot shower per hour. We have determined that a shower uses 80 liters of 40°C water that has been heated from a 15°C supply line. The receiver temperature must be greater than the desired water temperature of...

[b]1.I need to create an electronic system that automatically can measure and derive the IV and I-P characteristics (graph) and it must show maximum power point on the graphs. [b]2.The system must include a homemade voltage controlled electronic load that can load the solar cell with a well...

Can you please suggest me some books to read on this topic? It's for my final year project! I would much appreciate it!

I just discovered about solar storm named "Carrington Event"; I'd like to know how such a solar storm could affect my PC today. I found some publications: http://www.bu.edu/csp/EMMREM/papers/carrington.pdf...

Hi everyone Does anyone know of any source where the total amount of iron in the solar system has been estimated? Free iron, isotopes, oxides, etc. I've been reading here and there about element abundance on Earth and in the cosmos, and am curious if solar percentage of iron is...

Estimate the radius of a solar mass (2 × 1030 kg) black hole. How do I do it? I have literally no idea! Thanks in advance for any help.

I am trying to develop a btu calculator for my solar thermal water heater. I would eventually like to use labview to do the acquisition. I have an internal heat exchanger and know the temperature before and after it enters the exchanger. I have a flow meter w/ a pulse output. What would the...

So I was looking at my parent's power bill today because they've been complaining the bill is so high. I looked and as I knew for years, we get killed when we go pass what PG&E calls "300% over baseline". We live in the central valley in California where temperatures get to be up to 110 and that...

If a solar eclipse is visible near the equatorial region on the Earth, does it move from West to East at about 1000 miles/hr?

http://www.symmetrymagazine.org/breaking/2010/08/23/the-strange-case-of-solar-flares-and-radioactive-elements/" I just read this article. It suggests that solar activity has been shown to affect the rate of nuclear decay in the lab and that a particle may be responsible. Is this new information...

The ideas setup is this: There is a LED with solar panel and a battery, from one of the sun-charged nightlights, and an optic fiber (the "mirror") that routes the light from the LED onto it's own solar panel. The effect is that the light dims about half way down. Question: What...

Hy. What are the others known solar systems ? Thanks!

hi friends, i came across this piece of news... "Until 2010, no solar sails had been successfully used in space as primary propulsion systems. On 21 May 2010, the Japan Aerospace Exploration Agency (JAXA) launched the “IKAROS” (Interplanetary Kite-craft Accelerated by Radiation Of the Sun)...

Hello physicists! I'm a comp sci student and I am trying to graphically model a simplified version of the solar system as part of a programming exercise. In order to apply the gravitational forces to the planets, I need to compute the Jacobian matrix as it relates to two particles (planetary...

What started as a simple project, has become an out of control line of thought and a possible distraction, but one I think is worth picking up again. Several years ago I looked into the cost of solar for my home and the rebate that the city was offering for an approved installation. The cost of...

I have the following questions regarding solar panels. 1)Why solar panels which use sunlight concentrators gain in efficiency despite they produce larger currents?Usually it`s believed that with increase in current flow efficiency should fall. Example here is a fuel cells. 2)Currently...

Hy. From what it is known today, are there any forces that go up and down in cycles ? This regarding planet earth. I talk about whatever forces in the solar system and zodiac. Something like a few days or weeks up then down, then up then down etc. Thanks!

It is a question i have been thinking about for a while. When we look into the sky, are we actually looking at other stars or are we looking at our own sun from lots of different angles, we know light bends with the gravitational pull of planets. is it not possible that the light we see from...

Hi, I have some questions please... Can I use a 9 watt solar panel to charge a 12v battery directly? Do I need a rectifier or is the loss back into the solar panel too small to worry about? Also, can I use a 24v electric motor (permanent magnet generator) to charge a 12v battery - or is...

I would like to power a duct booster fan (which I believe uses little energy) using solar panels. The store website says the fan runs at .35 Amps. The solar panel would get direct sunlight for about 3 hours a day and indirect sunlight the rest of the day. I would like the fan to run at least...

What could be the worst damages in a very bad solar flare, but a solar flare that's likely to happen in the next couple years with the solar maximum, like a really high x class, what could happen on earth? If NASA or noaa knew about this happening, would they tell everyone, if they would, what...

(just tried general astronomy board but no luck) I'm trying to reproduce a plot of Sun's black-body behavior like this one: http://en.wikipedia.org/wiki/File:Solar_Spectrum.png Problem is, after I convert the black-body radiance to irradiance, its curve is way too high as compared with...

Hey guys, Homework Statement Im doing my physics coursework atm and its on the subject of Solar cells and am changing a few variables and observing how the voltage of the solar cell changes. I am also measuring the current and using that to calculate the Power output. the caluclations are...

Considering this is for a condensed matter course, I'm assuming it'll belong here :) I cannot, for the life of me, figure out why solar cells are operated in forward bias as that would counteract the electron-hole separation in the depletion zone. Wouldn't it make more sense to operate them...

I'm trying to reproduce a plot of Sun's black-body behavior like this one: http://en.wikipedia.org/wiki/File:Solar_Spectrum.png Problem is, after I convert the black-body radiance to irradiance, its curve is way too high as compared with measurement. The measurement data is taken from...

I need some help, I am planning on installing a 10 kilowatt solar panel array in the next couple of months. I will not be using a solar tracking device. The plan thus far is to determine the solar south bearing and face the panels in that direction and work out an appropriate angle for the...

Hello, I am not sure if I am posting in the right place, but here are my thoughts. I don't exactly understand how solar cell works, but it has to do with photons knocking out electron which makes the current flow. So I thought about the WiFi based charger. It generates electricity from...

For a junior design project i heard about a student using MATLAB to help operate a solar cell. Basically the sensors detected the light and shifted the p.v.cell into the lights direction, if you were to move light then cell would get re-adjusted. I guess my question is that I am not sure how...

I been looking at various places for measured orbital mechanics properties of the solar system and found very little coorelation. It made me think that somewhere there exists an official internationally recognized database for measured properties of the solar system with an accuracy that match...

What are the best solar panels in the market today?

I was watching a video on the JIMO mission to Jupiter's moons: Ganymede, Europa and Callisto. What is the approximate chance of life for these moons? And what about Titan, and Enceladus (misspelled?), can they be ruled out? What is the likelihood for water on these moons? If there is...

First off, I'm just learning the ropes of electricity, solar energy, batteries, wiring batteries in series and parallel, AC, DC, DC to AC Conversion and all that. But I do have the same need of energy as everyone else and a strong interest in finding ways to make my life a little less power...

I need a "SOLAR TAURUS 60" gas turbine operating and maintenance manual. Does anybody know who could sell me it or where can i have it??

Am looking to build a solar tunnel that would not only redirect solar visible light radiation, but also heat, with minimum losses. Basically need to deflect angle of incident radiation by around 30 degrees. Am considering an inverted truncated cone design, with a polished inner surface...

Hi everyone, I'd like to prepare a presentation about solar cells. I need a few articles about multijunction solar cells from popular magazines. If you can help me, please, post there links for these articles. Thank you, Anna