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
www.ellinogermaniki.gr/ep/eudoxoswww.ellinogermaniki.gr/ep/eudoxos
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