Solar Definition and 1000 Threads

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...

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

Homework Statement Consider what would happen to the temp of a solar array when a solar spacecraft gets into an eclipse. Distance to the Sun is 1 AU and Fs = 1368 W/m2 Consider an infinitely thin flat panel thermally isolated from the spacecraft . Assume the Specific Heat Capacity is 8.0...

Hi, I'm trying to find out the total number of solar neutrinos that interact with the human body per second or per lifetime. I know we are exposed to many, most which pass straight through us, but I'm interested to know how neutrinos interact with matter. Thanks.

From the little bit I've read online it seems like wind and solar have the most potential. Also, can you get student loans if you are unemployed? (I have a good credit rating and I'm in the US)

More goodies from NASA. This time around they've been able to capture some remarkable high-resolution photos of the Sun. They also got footage of the Solar Prominence Eruption on March 30, 2010. http://edition.cnn.com/2010/US/04/21/solar.observatory.images/

If all energy can be traced back to the sun, how would you calculate how much sun is needed to provide power to a home for one year? Is there a formula?

How to calculate the voltage produre by solar cell ? Need temperature reading or other apparatus ?

Hello! Right now I am trying to figure out how much of an affect dust has on the power production of some solar cells that I have. I was just searching for a possible material to use for dust testing. Anyone have any bright ideas?

Hello, I have a question about sunspots, to which the answer i could not find using google. Is the solar brightness dependant on how many solarspots are on the solar surface? I know that sunspots are cooler than the rest of the solar surface, however, the faculas that exist next to solar...

Hi everyone, i want to make sure that when i wire this all up I am not going to start a fire :) So, I've got a 4W 12V solar panel the unit produces up to 333mA a 12V battery and a 12V DC 15 RPM High Torque Gear Box Electric Motor. I'm a newbie so don't much about electronics. All i want...

I have a 67 ranchero that I have been wanting to turn into a solar electric car, with panels over the back. I built an electric car with some friends in High School, but as with all things, I am sure the tech. has changed a bit over the past two years. I know how to set up the array and the...

Homework Statement A projectile is fired from the Earth in the direction of the earth’s motion around the sun. what minimum speed must the projectile have relative to the Earth to escape the SOLAR SYSTEM? Ignore the earth’s rotation. Homework Equations escape velocity = sqt[(2G x...

Hi all, firstly I'm sorry because don't know which thread category should I ask from, but here goes: I'm doing my final year project about cooling solar panel with water film.basically it's flowing water over the panels. how can I calculate the water flow? does this have got to do with the q=...

I'm trying to measure solar radiation. Unfortunately I currently live in Bolivia, so I cannot get a solar cell. Instead I wanted to use a photodiode, but I wasn't able to find that either. Do you think that it is possible to measure solar radiation using a LDR? What about a phototransistor...

I know that the Earth rotates around the sun, but what does our solar system rotate around? P.S. I'm a noob when it comes to anything related to astronomy, sorry.

I tried connecting my solar cell, 7V/100mA to the ammeter. What I got is 1mA. Why? The voltage part is 6V, so I assume the efficiency should be at least around 6/7*100 %. But why is it only 1mA? I connected the solar cell straight to the ammeter. I need help fast. Thank you.

Hello. As a memorial I am trying to build a light-sensitive unit that will make an LED continuously glow at night. I want to put this in an extremely remote place and be reasonable confident that it will continue to operate indefinitely. The idea is that once it becomes dark, a photodiode will...

Hello, I have many time thought about AC & DC Motors, but have not yet find out. Example. if a motor of 4HP 48VDC. We give it power 48VDC but 1HP power, so what happens? And what if we connect it directly with solar panels of 48VDC and 4HP power. So when sunshine is lower how it will...

The theoretical maximum efficiency of silicon solar cells is about 29%. How is this theoretical maximum efficiency derived? How can I use the working principles of a silicon solar cell to explain this?

If i connect 76 solar panels (3v each) (that are found in calculators) together can i generate voltage of about 230v DC? if i connect this voltage to a GEYSER of 220v-240v AC does the GEYSER work

Hello. I am looking for an online book or course (free) regarding solar structure/physics at the first-year graduate level. Can anyone point me in that direction? I've looked into it but haven't come up with anything very useful. Thanks in advance!

This thread has been split off from the Gravity Probe B thread. Some posts here are duplicated in the above thread to keep a sense of continuity -- cristo[/color] Yes, but aren't you being dogmatic? Polestar101 is suggesting that the solar system is not orbiting the galaxy (at least, not only)...

Homework Statement At Earth’s location, the intensity of sunlight is 1.5 kW/m^2. If no energy escapes Earth, by how much would Earth’s mass increase in a day? (Radius of Earth is 6.37 × 10^6 m.) The Attempt at a Solution ok so, at anyone time, half of the Earth is lit. so surface area lit =...

if you had two spacecraft which had a solar sail as its means of Propulsion A & B, and were both identical. Spaceship A has light from the sun to push it along its way. Spaceship B has only gamma rays to push it along.(both craft have the whole of their sail surface covered with their...

I am interested in building a three shell mathematical solar model based upon the core, the radiative zone, convective zone. I have been researching to determine a way to build my first mathematical solar model. The best mathematical model for the core density function that I have located is...

Homework Statement Compute the solar irradiance in the near IR range (0.7 - 1.5 microns) at the top of the atmosphere over Denver at noon on August 23rd, and assume that 37 per cent of the solar spectrum is in this range. Homework Equations Equations? I=ScosZ where Z is the azimuth...

Just like we have solar n lunar eclipse. What is the name given when all the bodies in our solar system alligns in one line? And what are the effects of it on earth?