POLAR CORONAL HOLES

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A Link to Predicting Solar Maximum. Shea A. Hess Webber. W. Dean . Pesnell. Summer. 2010. Perimeter Tracking Method. SOHO EIT images, 3 wavelengths. Picking boundary points along limb. Limb brightening. ID: 465235 Download Presentation

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POLAR CORONAL HOLES




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Slide1

POLAR CORONAL HOLES

A Link to Predicting Solar Maximum

Shea A. Hess Webber

W. Dean

Pesnell

Summer

2010

Slide2

Perimeter Tracking Method

SOHO EIT images, 3 wavelengths

Picking boundary points along limb

Limb brightening

Thresholding

Tracking points over Harvey Rotation

Differential rotation

Approximately 27 days at equator (Carrington Rotation)

Approximately 33 days at the poles (Harvey Rotation)

Trig fit to resolve areas with uncertainties

Slide3

304 Å (He II) in

red

171 Å (Fe XI/X) in

blue195 Å (Fe XII) in green

Scale Height: H = kT/Mgk = Boltzmann constantT = Temperature (in K)M = mean molecular mass of particlesg = acceleration of gravity

Different ions at varying temperatures equate to different heights in the solar atmosphere.

304 Å

upper

chromosphere

171 Å and 195 Å

corona

Slide4

Perimeter Tracking Method

SOHO EIT images, 3 wavelengths

Picking boundary points along limb

Limb brightening

Thresholding

Tracking points over Harvey Rotation

Differential rotation

Approximately 27 days at equator (Carrington Rotation)

Approximately 33 days at the poles (Harvey Rotation)

Trig fit to resolve areas with uncertainties

Slide5

Slide6

Perimeter Tracking Method

SOHO EIT images, 3 wavelengths

Picking boundary points along limb

Limb brightening

Thresholding

Tracking points over Harvey Rotation

Differential rotation

Approximately 27 days at equator (Carrington Rotation)

Approximately 33 days at the poles (Harvey Rotation)

Trig fit to resolve areas with uncertainties

Slide7

Perimeter Tracking Method

SOHO EIT images, 3 wavelengths

Picking boundary points along limb

Limb brightening

Thresholding

Tracking points over Harvey Rotation

Differential rotation

Approximately 27 days at equator (Carrington Rotation)

Approximately 33 days at the poles (Harvey Rotation)

Trig fit to resolve areas with uncertainties

Slide8

Southern Polar Coronal Hole Average

Slide9

Northern Polar Coronal Hole Average

Slide10

Slide11

Slide12

Updated Data

Threshold adjustment in all wavelengthsExtended data time series from 2007 to 2010304 Å comparison with Nishu

Slide13

Further Work

Fine-tune thresholds

Adjust programs to run by HR vs. by year

Convert programs to work with SDO data

Do similar image analysis with magnetograms and compare

Re-address solar B angle periodicity

Slide14

Acknowledgments

W. Dean PesnellNishu KarnaPeter WilliamsMike KirkAlex YoungMost of the Solar Physics scientists…

Background Image: SDO AIA Composite Image

Data Images: SOHO EIT Images

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