1 / 24

SUN COURSE - SLIDE SHOW 4

SUN COURSE - SLIDE SHOW 4. Show 1 -- photosphere & sunspots. Today: Sun today + waves + prominences +UFO’s. Show 2 -- corona & solar cycle. Show 3 -- SOHO. Sun today from SoHO. Photo sphere. Magnetic Field. Corona (2.0 MK). LASCO C2. 2. Waves on Sun - 4 exs.

branden-gonzalez
Download Presentation

SUN COURSE - SLIDE SHOW 4

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SUN COURSE - SLIDE SHOW 4 Show 1 -- photosphere & sunspots Today: Sun today + waves + prominences +UFO’s Show 2 -- corona & solar cycle Show 3 -- SOHO

  2. Sun todayfromSoHO Photo sphere

  3. Magnetic Field

  4. Corona (2.0 MK)

  5. LASCO C2

  6. 2. Waves on Sun - 4 exs (i) Waves in penumbra of sunspot

  7. (ii) Wave from Flare In photosphere (MDI) (8-100 km/s 70 mins)

  8. (iii) Solar Interior Guitar string can oscillate in different normal modes Sun too Recently SOHO discovered several million !! 3D Schematic

  9. Sound waves - trapped in convection zone -reflected at top/ refracted at bottom - different waves sense diff. regions Use properties to infer structure interior Helioseismology i.e., wave turns !!

  10. (iv) Possibly Important for Heating Corona to few MK 2 mechanisms: Reconnection or Waves Originally suggested sound waves - > generate by turbulence - propagate up - shocks But - not observed - magnetic regions hotter ?? Magnetic waves

  11. From TRACE discovered waves after eruption

  12. 3. Prominences On disc in Halpha, see long, thin “filaments” • 200 Mm x 6 Mm • Dark - cutting out light from below • Inside a.r. - small • Outside - large (feet) At limb - 50 Mm i.e. in corona

  13. On Disc

  14. 3D Structure

  15. At Limb

  16. Fine Structure Large Quiescent Prominence -> transverse magnetic field inclined to axis

  17. Active Region Prominence --> Field along prominence --> Magnetic flux tube

  18. In Eclipse

  19. Properties • Immense, dense, cool vertical sheet of plasma in corona • Density 10 17 m-3 (1000 corona) • Temperature 10, 000 K ( 0.01 corona) • Change slowly in shape --- long-lived (1-200 days) • Much fine structure • Reach down in series of “feet” • Lie along “polarity inversion line” • At some stage, may become unstable - ascend and disappear: An erupting prominence • Generally reform in same place

  20. Polarity inversion line

  21. Erupting Promin ence

  22. Finally - Granpa

More Related