View
28
Download
0
Category
Tags:
Preview:
DESCRIPTION
Periodicities in the Solar Wind Tenative CSI 763 Research Project Christina Henderson. Outline. Discuss solar wind and solar rotation Parker spiral, differential rotation rates Examine Ulysses spacecraft and data Attempt to reproduce analysis from Roberts and Goldstein paper - PowerPoint PPT Presentation
Citation preview
Periodicities in the Solar Wind
Tenative CSI 763 Research Project
Christina Henderson
Outline
● Discuss solar wind and solar rotation● Parker spiral, differential rotation rates
● Examine Ulysses spacecraft and data● Attempt to reproduce analysis from Roberts
and Goldstein paper● Additional topics
The Parker Spiral
Image Credit: J. Luhmann
Differential Rotation
Image Credit: SOHO's SOI/MDI
Theoretical Heliospheric Current Sheet
Image credit: NASA artist Werner "Gredoč" Heil
The Ulysses Spacecraft● Purpose: study heliosphere as a function of latitude● Achievements:
● Jupiter encounter: June 8, 1992● High Northern latitudes June through September 1995 (solar minimum)
● High Southern latitudes September through December 2001 (solar max.)
● Measures: magnetic field, particle density, plasma velocity, cosmic rays, X-rays/gamma rays, radio waves, plasma waves, dust
Trajectory
“Evidence for high-latitude origin of lower latitude high-speed wind”
- Roberts & Goldstein (NASA GSFC) performed statistical analyses on Ulysses density, velocity, and magnetic field data
- Data analysis exhibited harmonics of fundamental frequencies at 26 and 34 day periods
- Found that wind seen within 30° of the solar magnetic equator actually comes from greater than 60°, confirming previous current sheet configuration
Time series - 1992
Time series – 1993
Things to consider
- more data, less data?
- pre-whitening?
- linear interpolation suitable for gaps?
- error bars actually significant?
- F-test?
Additional Topics
● Geomagnetic effects on airline fares
● SWx big concern for airlines● Millions lost in rerouting of polar flights● Who pays for this? Likely the consumer● Need to build a data set - web-scraping
● Geomagnetivity and rate of heart attacks
Recommended