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Validation/Reconstruction of the Sunspot Number Record, 1841-2007 - PowerPoint PPT Presentation


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Validation/Reconstruction of the Sunspot Number Record, 1841-2007 E.W. Cliver Air Force Research Laboratory, Space Vehicles Directorate, Hanscom AFB, MA L. Svalgaard

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slide1

Validation/Reconstruction of the

Sunspot Number Record, 1841-2007

E.W. Cliver

Air Force Research Laboratory, Space Vehicles Directorate, Hanscom AFB, MA

L. Svalgaard

Easy Tool Kit, Inc., Houston, TX

IUGG

July 2007

slide2

Sunspot Number (SSN) Applications

          • Solar Dynamo
          • Space Weather/Climate
          • Cosmic Ray Modulation
          • Climate Change
slide3

Two SSN Series

RINT: 1700 - 2007 (SIDC/ROB)

RG : 1610 - 1995 (Hoyt & Schatten, 1998)

slide4

SSN

Dec

HF

Ellis (1898)

SSN correlated with daily range of

geomagnetic elements

slide6

Wolf (1875) used the SSN-daily range

relationship to adjust the SSN for years

before 1848

Rudolf Wolf

slide7

Step 1

Show that over extended periods of time (decades, centuries) constant, stable

relationships exist between rY at stations such as Niemegk and Honolulu that are

widely separated in longitude and latitude.

slide8

Step 2

Link together observations of the regular variation observed at long-term stations (normalizing to Niemegk and using Oslo to bridge the gaps for early years) to obtain the variation of SRsince 1840

slide9

Step 3

Relate average rY to RINT ( & F10.7)

slide10

Step 3 (continued)

The daily range rY is highly correlated with RINT& F10.7

at all phases of the sunspot cycle

slide11

Step 4

Use the RINTvs. rY relationship to obtain a

new SSN series back to 1840

slide12

Step 5

Obtain correction factors for each cycle for the International and Group SSN series

slide13

Provisional SSN Series:

Cycles 10 & 11 comparable to 22 & 23

slide14

Work in Progress

  • Strengthen 1840-present series
  • Extend before 1840
  • Determine causes of jumps in 1893 & 1945
  • Determine effect of Earth’s decreasing
  • dipole (~10% since 1840)