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High latitude meridional flow on the sun may explain north-south polar field asymmetry (Document No: 20130003206)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Kosak, Katie Upton, Lisa Hathaway, David |
| Copyright Year | 2012 |
| Description | We measured the flows of magnetic elements on the Sun at very high latitudes by analyzing magnetic images from the Helioseismic and Magnetic Imager (HMI) on the NASA Solar Dynamics Observatory (SDO) Mission. Magnetic maps constructed using a fixed, and north-south symmetric, meridional flow profile give weaker than observed polar fields in the North and stronger than observed polar fields in the South during the decline of Cycle 23 and rise of Cycle 24. Our measurements of the meridional flow at high latitudes indicate systematic north-south differences. In the fall of 2010 (when the North Pole was most visible), there was a strong flow in the North while in the spring of 2011 (when the South Pole was most visible) the flow there was weaker. With these results, we have a possible solution to this polar field asymmetry. The weaker flow in the South should keep the polar fields from becoming too strong while the stronger flow in the North should strengthen the field there. In order to gain a better understanding of the Solar Cycle and magnetic flux transport on the Sun, we need further observations and analyses of the Sun s polar regions in general and the polar meridional flow in particular. |
| File Size | 7181 |
| Page Count | 1 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20130003206 |
| Archival Resource Key | ark:/13960/t4jm7866m |
| Language | English |
| Publisher Date | 2012-12-03 |
| Access Restriction | Open |
| Subject Keyword | Solar Physics Helioseismology Magnetic Flux Meridional Flow Asymmetry Solar Cycles Sun Polar Regions Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
