mount wilson solar photographic archive digitization project the 60-foot solar tower in 1914
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![Page 1: Mount Wilson Solar Photographic Archive Digitization Project The 60-foot Solar Tower in 1914](https://reader035.vdocument.in/reader035/viewer/2022062516/56649d405503460f94a198f4/html5/thumbnails/1.jpg)
Mount Wilson Solar
Photographic Archive
Digitization Project
Mount Wilson Solar
Photographic Archive
Digitization Project
The 60-foot Solar Tower in 1914.The 60-foot Solar Tower in 1914.
![Page 2: Mount Wilson Solar Photographic Archive Digitization Project The 60-foot Solar Tower in 1914](https://reader035.vdocument.in/reader035/viewer/2022062516/56649d405503460f94a198f4/html5/thumbnails/2.jpg)
Project PersonnelProject Personnel
• Roger Ulrich, P.I.• Ferenc Varadi, Geophysicist• John Boyden, Programmer• J. Javaraiah, Post Doc, Data Analyst• Sandrine Lefebvre, Post Doc, Data Analyst• Liz Werden, Archivist
• Roger Ulrich, P.I.• Ferenc Varadi, Geophysicist• John Boyden, Programmer• J. Javaraiah, Post Doc, Data Analyst• Sandrine Lefebvre, Post Doc, Data Analyst• Liz Werden, Archivist
![Page 3: Mount Wilson Solar Photographic Archive Digitization Project The 60-foot Solar Tower in 1914](https://reader035.vdocument.in/reader035/viewer/2022062516/56649d405503460f94a198f4/html5/thumbnails/3.jpg)
Why Study Old Solar Images?
• The level of solar activity is measured by The level of solar activity is measured by the brightness of the Ca II K line.the brightness of the Ca II K line.
• Rotation of solar features can be measured Rotation of solar features can be measured at high latitudes using the Ca K images.at high latitudes using the Ca K images.
• The level of solar activity is measured by The level of solar activity is measured by the brightness of the Ca II K line.the brightness of the Ca II K line.
• Rotation of solar features can be measured Rotation of solar features can be measured at high latitudes using the Ca K images.at high latitudes using the Ca K images.
![Page 4: Mount Wilson Solar Photographic Archive Digitization Project The 60-foot Solar Tower in 1914](https://reader035.vdocument.in/reader035/viewer/2022062516/56649d405503460f94a198f4/html5/thumbnails/4.jpg)
Variability of the Solar
Cycle
• The Sunspot Number has systematically increased during the 20th Century.
• The period of no sunspots is called the Maunder Minimum
![Page 5: Mount Wilson Solar Photographic Archive Digitization Project The 60-foot Solar Tower in 1914](https://reader035.vdocument.in/reader035/viewer/2022062516/56649d405503460f94a198f4/html5/thumbnails/5.jpg)
Variability of the Solar
Rotation Rate
• The rotation rate can be determined by tracking the traversal of features across the solar disk
• At the end of the Maunder Minimum the sunspot rotation rate was reduced.
![Page 6: Mount Wilson Solar Photographic Archive Digitization Project The 60-foot Solar Tower in 1914](https://reader035.vdocument.in/reader035/viewer/2022062516/56649d405503460f94a198f4/html5/thumbnails/6.jpg)
The Mount Wilson Solar Photographic Archive
The Mount Wilson Solar Photographic Archive
• George Ellery Hale Established the Mount Wilson Solar Observatory in 1906.
• Starting in 1915 spectroheliograms in the light of the Ca II K line were taken twice per day.
• Also about the same time “White Light” Direct images were taken once per day.
• There are approximately 45,000 images in the K line and approximately 30,000 images in white light.
• These images will be digitized and posted for distribution on the web.
• George Ellery Hale Established the Mount Wilson Solar Observatory in 1906.
• Starting in 1915 spectroheliograms in the light of the Ca II K line were taken twice per day.
• Also about the same time “White Light” Direct images were taken once per day.
• There are approximately 45,000 images in the K line and approximately 30,000 images in white light.
• These images will be digitized and posted for distribution on the web.
![Page 7: Mount Wilson Solar Photographic Archive Digitization Project The 60-foot Solar Tower in 1914](https://reader035.vdocument.in/reader035/viewer/2022062516/56649d405503460f94a198f4/html5/thumbnails/7.jpg)
A Full Deck Scan
A Full Deck Scan
• The large-bed scanner can scan 5 plates simultaneously.
• Presently only 3 plates can be accommodated.
• The full-deck scan is 300 Mbytes in size.
• Details of this image are shown in the next few slides.
• The large-bed scanner can scan 5 plates simultaneously.
• Presently only 3 plates can be accommodated.
• The full-deck scan is 300 Mbytes in size.
• Details of this image are shown in the next few slides.
July 1, 1925
June 20, 1921
June 30, 1921
![Page 8: Mount Wilson Solar Photographic Archive Digitization Project The 60-foot Solar Tower in 1914](https://reader035.vdocument.in/reader035/viewer/2022062516/56649d405503460f94a198f4/html5/thumbnails/8.jpg)
One Solar Image
One Solar Image
• This shows more detail.
• This shows more detail.
![Page 9: Mount Wilson Solar Photographic Archive Digitization Project The 60-foot Solar Tower in 1914](https://reader035.vdocument.in/reader035/viewer/2022062516/56649d405503460f94a198f4/html5/thumbnails/9.jpg)
The Image
with the Clear Plate
Enhanced
The Image
with the Clear Plate
Enhanced
![Page 10: Mount Wilson Solar Photographic Archive Digitization Project The 60-foot Solar Tower in 1914](https://reader035.vdocument.in/reader035/viewer/2022062516/56649d405503460f94a198f4/html5/thumbnails/10.jpg)
Aug. 17, 1915 to Aug. 21,
1915
Aug. 17, 1915 to Aug. 21,
1915
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A Sequence of Images Showing
Solar Rotation
A Sequence of Images Showing
Solar Rotation