Solar Definition and 1000 Threads

What is the source of sunlight? The answer is Solar spectrum. Can anyone explain how the crimson color is created? actually what happen when the sunlight is created? Need help from the expert.

Homework Statement Design a solar cell, designed to absorb solar light. Treat the sun as a blockbody source of T=5800K. To design the cell, you may grow 4 very thin semiconductors of the following bandgaps, in eV: 1.43, 1.14, 1.35, 0.67, 1.75, 2.4, 2.7, 0.42, 3.37 Which of these would you...

dear experts i saw a solar charger the size of an iphone that has high amperage rating of over 1000mA to 2000mA. Based on the solar cell size i estimate it to produce at most 250mA at around 5 volts. I like to know how the high amperageis derived. is it using super capacitors ? if...

Hi All Whenever there is a solar activity two things are mentioned, SPE, CME and X-ray. Does anyone know the difference between SPE and CME? I couldn't find a descriptive or convincing answer on these two. What particles are associated with CME, is X-ray a part of CME? And what effects could...

Dear Experts There are solar charging devices in the market for electronic devices. These contain some electronics which I suppose is to regulate the power or as controller. Lets say I have a 6 volts device and I have a solar panel rated at 6v. If without any electronic controller...

Specifically, could Venus have otherwise formed as one, while leaving the rest of the structure of the solar system pretty much intact? Failing that, could one have formed anywhere in the solar system?

I have a final year project which is to design and build a solar golf cart. I have system for the electrical part of the design in mind, I would just like some clearance on whether these components will actually work. Here goes, this is what i was thinking of: 1. 1 x 200W PV Panel 2. 1 x...

Could someone comment on the particle constituents of the most recent "solar storm". A look at the films of the SOHO observatory show very marked particle trails on the photo-active medium shortly after a large explosion of 1429. The print media made mention of two Earth observations, one of...

I live in AZ so besides the "bubla" or whatever that stupid name is for a huge wall of dust we get that's crazy huge is about as bad as our weather gets. Basically Solar Flairs are the biggest threat to me and my dog, so its my the natural disaster of choice when thinking about different...

http://www.nzherald.co.nz/technology/news/article.cfm?c_id=5&objectid=10790597 Will it be hitting all around the Earth, or only in particular areas? If anyone knows...

I'm making a circuit using piezoelectric discs and i wanted to attach solar panels in parallel as well in order to increase amperes of the circuit. However, when put in conjunction the piezoelectric discs seem to have no effect on the circuit, when previously they had been contributing 5 or more...

Hello Forum, I am trying to perform a solar cell experiment. I went to several websites and they list their small solar cells panels as having an output of 0.5 volts, 100mA. The cell size is 1 3/4" X 1"... Does 0.5 V represent the open circuit voltage, when the cell receives the max...

Homework Statement Hey everyone, as part of a final year project I am looking at the economic feasibility of solar panels and whilst I have solar data for radiation intensity on flat surface, longitude (and plus or minus 15°) and 90° I am trying to find a calculation of intensity at any...

Dear Forum Users, I am looking for a database of proton fluxes. I have found already the SOHO database: http://umtof.umd.edu/pm/ but I need also the database for energy range of 1keV to 100 keV range. Does someone could send me some hints where to search? nykon

Hi guys, I have a question about the difference in the time it takes a neutrino to escape the core of the sun compared to the time it takes a photon to escape from the core of the sun. Basically, my question is: what is the difference between photons and neutrinos that makes neutrinos very...

i have to come up with expression that governs the rate of solar energy incident upon the Earth with radius of Earth, Re, power output of Sun 4*10^26 and distance from Earth to Sun as 1.5*10^11. But i have no idea how to get the expression HELP

Hi, ive been studying formation of solar system and couldn't find an explanation for why the sun didn't absorb heavy elements from early solar system? why they remained around the sun and formed planets and not get absorbed to the centre? thanks in advance

Homework Statement I am trying to show that the average solar irradiance over Earth's surface is 1/4 of the total solar irradiance using only calculus. Homework Equations Solar Irradiance = S_{o} Irradiance = F = S_{o}cos(θ) The Attempt at a Solution Using geometry, I can easily...

Solar Eclipse Problem (a math problem, not about astronomy) Homework Statement To a good approximation, Earth and Jupiter move around the Sun in circular orbits of 1.49 x 108 km and 7.79 x 109 km radius, respectively. What is the maximum error that can arise in the prediction of solar...

Anyone heard of the "solar snake" Solar system theory? hello this is my first post and i am far from being a physicist or an astronomy major so please bear with me A friend sent me this link Mod note: link removed[/color] this man named Dr. Bhat wrote a book explaining how the solar system...

I would like to know what the effects of a solar flare would be on equiptment used for lunar exploration, say a robot to be specific. What kind effects would this have on the electrical system? I also read a NASA article describing a large solar flare that created a long enduring proton...

Hey guys. This is my first post here and I hope many more will follow. Now on to the topic at hand… I’ve been doing some research into the solar system’s formation and evolution. As many of you are probably aware, the solar system’s heavier elements are believed to be the remnants of a...

Hello, my name is Stefan and I am a twelfth grade high school student working on an extracurricular project which I will present and be ranked(individually; non-competitively) on. I hope to achieve the best possible score and plan to put a lot of work into it. I have a little over a month, which...

Hey all, I wake up with morning to find an email from spaceweather which says: EARTH-DIRECTED FLARE: Active sunspot 1401 erupted today, Jan. 19th, for more than an hour around 16:00 UT. The long-duration blast produced an M3-class solar flare and a CME that appears to be heading toward...

Let us have a photo-voltaic circuit. The amount of emf induced in the photo-voltaic material is in direct proportion to the amount of photons(intensity) falling at it. Hence if we move the photo-voltaic material in a direction towards the source of the light, it must generate an increased emf...

Didnt einstein show that the work function depends on frequency not intensity? If so, than why does the Wysips cell use a magnifying array? Sorry i don't have a pic, but a diagram of the solar cell may be found using google images.

One of the things that is supposedly possibly happening as a 2012 disaster is solar activity like flares or coronal mass ejections. This is a good possibility even if it's all hysteria. These events can supposedly theoretically take out electronics. If this happened we would be hurting because...

http://img407.imageshack.us/img407/9447/duo258.png Would a CME passing through the Moon's electrically conducting interior affect the Earth's magnetic field any differently than a CME that had not gone through the moon?

I'm working in the Power Systems team of CubeSAT. It is concerned with building a small student satellite with dimensions of 10x10cm. Our basic block diagram is as follows Solar panels-> In parallel Shunt Regulator -> Buck Converter->PRU (MAX8934A)->DC-DC Converters->Loads The shunt...

I have been trying to find some values for how much watts per square meter there is of energy on the ground due to the sun, but everywhere there are different values ranging from 100-1000 Watts so I have no clue of what to believe... And also are these values per second/minute/day? So however...

http://science.nasa.gov/media/medialibrary/2011/12/16/lovejoy_c3_anim2.gif http://spaceweather.com/ <--- archive December 17, 2011 In a rare curiosity of nature, Comet Lovejoy appears to transit the elevated temperatures of the solar corona, laughing off the sizzling encounter, seemingly even...

I've been seriously considering uhm... telling my parents that they should put solar panels on their roof :P I wanted to get a decent estimation as to whether or not the idea is silly. What kind of things should I look into to determine whether or not this will be a financially viable option? We...

Homework Statement I'm a sort of a newbie student studying solar cell for 2 months and having my test next week, so I've in need of help here! 1) Identify the majority and minority carriers in p-type silicon with n-type silicon solar cell? 2) Explain the term diffusion and drift current? 3)...

So I was talking with a guy last night who was trying to tell me this: Our galaxy is stirring up as it spins and this might cause another planet to come along and collide with earth. My first comment was that the stuff in the galaxy is all caught up in the same "stirring" motion, so it's not...

I'm looking at some code from a book that details uses the heliocentric position and velocity to compute an orbit of a meteor. See attached pages. At the top of the section at mid-page, page 37, he gives a source, Herget, 1953, Solar Coordinates 1800-2000. The book was written in the...

Hello I am designing a solar oven that will be used to form denture moulds. My thoughts are designing an insulated box with a doubloe pane glass double creating a green house effect. But i would like to incorporate solar panels and a wired heated filament. My question is what is the...

[FONT="Verdana"][SIZE="5"] Hello, total layman here. I have some questions & ideas, but no one to discuss them with, so here I am. 1. In the continuum between a completely circular orbit, and a maximally elliptical orbit, what characteristics of the orbital body and the gravitational source...

i would like to design a solar assisted driving mechanism for my bicycle? What is the compatible battery specifications to power 24v 1hp dc motor and the necessary solar panel specification to charge the battery? I'm kinda clueless in this so any help would be deeply appreciated. Thanks

The panels are up. 7kW system will be 110% of our electrical needs. Grid intertie, no batteries, no pile of money up front: $109/month for the next 15 years. Plus dig the new deck I built last summer. --Chi "Happy Homeowner" Meson

Homework Statement I am reposting an edited version of this problem from a previous post of mine, due to it not being entirely relevant to that post, and also the question was asked after the thread had been replied to, so looks like an answered question. I also aim to give more detail here...

Homework Statement I am try to understand how the value of 1370 watts per metre squared for the intensity of sunlight hitting the Earth has been derived. Is there a way to see this mathematically? Homework Equations I understand about how the intensity is related to Poyntings vector, by...

And directly related to that: How can we be sure of the speed of light? I've been searching for a good answer as to how we measure the SOL and am yet to have someone give me a solid explanation. Today we shine a laser at a mirror on the moon and time how long it takes to get back. What it...

If I keep this up, I'm going to get a rep around here :). So, I recently acquired a fiberglass satellite dish which I plan to use for building a cheap, solar powered distillation machine. The idea is to have the dish, calculate the focal point, and run a double glass plated chamber at the focal...

My son is a 3rd grader and wanted to do a science fair project on solar cells. So we devised an experiment to see if reflecting light with a mirrow would increase power output. We constructed a circuit using an amp-meter, solar cell, and 10Kohm resistor. He hypothesized that reflecting sun...

Homework Statement Consider a planet in some solar system which has a mass double the mass of Earth and same density as of Earth . What is the weight of object on the planet in terms of 'W' , where 'W' is weight of object on Earth Homework Equations W=mg ... density = M / V . ...

Howdy all, I am developing a high altitude weather balloon project and I am thinking of using HDPE as a lens material for THz optics. I need to know the total heat transfer on the sheet of HDPE to see if it will reach critical temperatures. Since I am only looking for critical temperatures I...

Before reading this article please read the following: NEVER view the sun with the naked eye for any length of time, as doing so may cause irreversible eye damage or even blindness. Solar filters and solar glasses are not made to any officially regognised safety standard in all countries, and...

Hi, On various websites I read that 70% of the heat loss of a pool is by evaporation, whereas up to 85% of the solar radiation can heat an uncovered pool. We use 22mm thick black color EPE panels to cover our pool. On a sunny day, is it better to cover the pool or to leave it uncovered ...

Excuse the English.. it is not my first language. Sorry if this topic doesn't fit theme of board. How can build solar building model house? The temperature must stay within room temperature, outside. Any large divergence will take points off.. the time frame is eight thirty to nine thirty...

Hello I am currently building DIY solar panel.I have a problem regarding the build up of the panel. My question is can I attach the cells on to a normal transperant glass of about 5mm thick by a transperant silicon? My concern is if the cell will break or not, by the outer environment ...