Eudoxos projectEudoxos project

Does the Sun Rotate?Does the Sun Rotate?

Dr. Omiros KorakianitisDr. Omiros KorakianitisEllinogermaniki AgogiEllinogermaniki Agogi

Teachers workshopTeachers workshop

NCSR Demokritos, NCSR Demokritos, March March 20032003

Does the Sun Rotate?Does the Sun Rotate?

Class:Class: Technology, Astronomy, Technology, Astronomy, PhysicsPhysics

Grade:Grade: Senior High SchoolSenior High School

Lesson:Lesson: Study of the Solar RotationStudy of the Solar Rotation

DescriptionDescription

Educational outcomeEducational outcome

PurposePurpose

Educational approachEducational approach

Equipment requiredEquipment required

Short descriptionShort description

DescriptionDescription

The structure of the lessonThe structure of the lesson

IntroductionIntroduction

Detailed description of the teaching procedureDetailed description of the teaching procedure

TheoryTheory

Dark SunspotsDark Sunspots

TheoryTheory

Solar RotationSolar Rotation

Sidereal rotation period: 25,380 daysSidereal rotation period: 25,380 days

Mean synodic period: 27,275 days Mean synodic period: 27,275 days

TheoryTheory

Solar RotationSolar Rotation

Measurement using coordinatesMeasurement using coordinates

)( minmaxminmax41 yyxxR

Rotation period determinationRotation period determination

tL oo 986,0

tt

LL

t

L

1

1

360

i

Student activitiesStudent activities

Avis ViewerAvis Viewer

Measure the xmin, xmax, ymin, ymax Compute xc, yc, R

Measure the xm, ym for each one of the sunspots

Compute x, y

Compute X, Y

Complete the tables

Student activitiesStudent activities

t

Sunspots

a b c d

(days) B L-L0 B L-L0 B L-L0 B L-L0

0,000

Student activitiesStudent activities

t

Sunspots

a b c d

(days) B L-L0 B L-L0 B L-L0 B L-L0

0,000

0,979

1,979

3,188

Student activitiesStudent activities

t Δt L0

Sunspots

a b c d

L-L0 L ΔL L-L0 L ΔL L-L0 L ΔL L-L0 L ΔL

0,000

0,979

1,979

3,188

Student activitiesStudent activities

Compute ων(aver) for each one of the sunspots

Finally transform the ων(aver) to a rotation period

Tν(aver) for each one of the sunspots

Extra activities - discussionExtra activities - discussion

Estimate the errors of this method by calculating the

statistical standard deviation

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