Solar Definition and 1000 Threads

I'm currently doing a project on how the solar wind interacts with the Earth's magnetic field, but I'm having a hard time grasping the concept of the plasma emitted by the Sun and how it shapes the Earth's magnetic field. I read somewhere about a simple mirror dipole approximation (I'm guessing...

At what altitude does a solar panel see a noticeable increase in wattage/cubic meter if it is lifted into the air? I understand the maximum is a bit over 1 kilowatt/meter2 at sea level (not actually converted to usable energy, this is much less and depends on the technology) but that this...

Homework Statement Find the reaction rate of a star purely of Hydrogen at temperature of 15MK, density of 150gm/cm^3, most of the reactions take place at R0=0.25R. Each reaction released energy of 25MeV Homework Equations This is the part I'm lacking. I've got the number of protons...

Homework Statement I don't know if this is a physics problem per se but its from physics class. So we were supposed to pick out a solar panel and figure out what is the cost per unit of energy for this form of solar energy? I know where supposed to use the data sheet for the panel that we...

Dear Experts I like to check with you , if I have 3 solar panels : 3v polycrystaline, 0.5v monocrystaline and other types of solar panel at 12v, and I connect them in series. Any side effects? Is it not advisable? I am assuming that there will be no problem and all the voltages will just...

Hey guys, 1. basically I am using the silvaco athena and i got some code to make the solar cell simulation. and my project is basically about designing pn junction in terms of the solar cell. kinda clueless of what are things that i need to modify in the code to make sure that i have a good...

Homework Statement A)Calculate the magnitude of the angular momentum of the Earth in a circular orbit around the sun. B) Is it reasonable to model it as a particle? Yes, considering the size of the Earth in comparison of its orbit around the sun it is reasonable to model it is a particle...

I'm reading a paper on photovoltaic hydrogen production and the author claims that for reasonable solar efficiencies the band gap must be less than 2.0eV. This I understand. My question is how will it effect the photon absorption if the band gap is much smaller. Say the band gap energy is...

We are creating a solar device that locates the optimal position to gather sunlight, and then stores the light in an AGM battery that we have. We have a 6v battery and we ordered 4 6v solar cells. Unfortunately the 6v solar cells did not come in. There are 4v solar cells in one of the labs at...

I've been building a solar system integrator using C++, OpenGL for graphics, Qt for UI and I would like some info about the choice of integrator. The project is at a pretty advanced stage now and I'm currently adding all moons since graphically it's doing well, I can move about the whole system...

Hi, I am a student at Lehigh University. I don't know if this is a appropriated place to post this, but I kind of need some help on this. In one of my project courses, I am placed in a team with students of various majors to develop a solar collector (not solar panel, but a solar dish) for...

Hi there, im doing school project regarding Solar Food Dehydrator. Can tell me what is the formula to calculate the light intensity from the sunlight?

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 this man named Dr. Bhat wrote a book explaining how the solar system is not on...

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...

Hello, I was investigating 'Asymmetrical P-N Junctions'. If the doping concentration of the P and N type semiconductors are different then the P-N junction they will form will be a asymmetrically doped Junction. I searched and come up with the fact that 95% of the solar cell structures are...

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)...

I am a 17 year old high school student in Alabama, and after my astronomy test today, I decided to calculate the mass of all interstellar gas and dust in our solar system (under the assumption that the solar system extends to 55,000 AU in all directions) and I calculated the mass to be a...

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 am trying to find the Absorbed dose for Silicon cells on a geostationary satellite from a period of (1996 to 2005) The Equation I have is: D(rad) = 1.68e-8 *((1/ρ)*dE/dx) * Phi Where: D is absorbed dose and units are (100 ergs/g or 0.01 J/Kg) (1/ρ)*dE/dx = (MeV*cm^2)/g...

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...