WHAT EVIDENCE DO WE HAVE FOR SOLAR CONVECTION

(Grades 9-12)

Purpose:To create a visual convection current in the classroom and also compare it to the images taken of convection cells in the Sun.Teacher Information

Convection is the transfer of power because of density distinctions when not in a free-fall (microgravity) atmosphere. As a liquid or gas is heated it expands and becomes much less dense and therefore lighter. If a cooler denser product is above the hotter layer the warmer material will certainly climb with the cooler product to the surface. The increasing material will certainly dissipate its warm (energy) right into the surrounding environment, come to be more thick (cooler), and will sink to begin the procedure over.

You watching: What evidence do we have for solar convection

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The source of the Sun"s power is the nuclear reactions that take place in its core. Tright here, at temperatures of 15 million levels Kelvin, hydrogen atom nuclei, called protons, are foffered and end up being helium atom nuclei. The power created via fusion in the core moves external, initially in the develop of electromagnetic radiation dubbed pholots in the so-referred to as radiative zone. Next off, power moves upward in photon heated solar gas. This kind of energy deliver is convection. Convection motions within the solar inner geneprice magnetic areas that emerge at the surconfront as sunspots, and loops of hot gas called prominences. Most solar power lastly escapes from a thin layer of the Sun"s setting referred to as the photospright here, which is the part of the Sun observable to the naked eye. Convection cells have the right to be checked out on the surchallenge of the Sun favor the image that follows.
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The activity is a simulation of this photo.

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Activity: Displaying Convection

Materials:
a hot platea little sauce pan, beaker or glass pie panrheoscopic fluid* or apple cider Type of Activity: teacher demonstrationProcedure: Place the container through the fluid on the hot plate on the lowest establishing. Within a pair of minutes you should view a reaction. If the reactivity starts to dissipate, increase the heat by a very small amount.Questions:Why does the reaction dissipate?Would this dissipation take place on the Sun? Why?Does your monitoring of the simulation coincide with the photo above?Remembering why convection occurs, would certainly this take place in a microgravity (free-fall) environment?Related links:Study agranulation image and take the granulation quiz at the Stanford Solar CenterEducator"s Guide to Convection including simulations of convection listed below the Sun"s surconfront.Connections to the National Standards: (Grades 9-12)Understands energy forms, sources, and conversions, and also their partnership to warmth and also temperatureKnows that power often tends to move spontaneously from hotter to cooler objects by conduction, convection or radiation; similarly, any kind of ordered state has a tendency to spontaneously come to be less ordered over time*NOTE - apple cider will certainly work for this task yet a better material is Rheoscopic Fluid by Novostar Designs, Inc. Burlington, N.C. 1-800-659-3197. The listing of the proprietary name in this section is not an endorsement of the product. The firm name noted is only a pointer.Created by: Dennis ChristopherDirect Comments to: therese.a.kucera