User Tools

    To create and edit articles, please register and log-in

Main Menu : categories & index etc.

Main menu
Click categories to expand

A-Z listingplugin-autotooltip__plain plugin-autotooltip_bigA-Z listing

This is an alphabetical index of all content pages.

Other categories



Also see

Importance Ratings
Curator's rationale
AI Policy

Twitter feed 𝕏

Feeds + s.e.o. etc.
rss / xml feed
sitemap file
A-Z listing (archived)

Indexed under : Physics / Cosmology

Wikenigma - an Encyclopedia of Unknowns Wikenigma - an Encyclopedia of the Unknown

Sun's coronal heating problem

The Sun's outer corona - stretching millions of kilometers out into space from the surface - reaches temperatures of up to 4 million °C.. This contrasts sharply with the surface of the sun which has been measured at around 6 thousand °C.

A number of possible mechanisms have been proposed to explain why it's so hot. They include:

  • Slow and fast magneto-acoustic surface waves
  • Current (or magnetic field) dissipation
  • Microflares/transients
  • Mass/particle flows
  • Magnetic flux emergence
  • Alfvén body wave heating
  • Magnetic re-connections
  • 'Spicule' conduction

As yet, none has been definitely confirmed as the cause. See Wikipedia for details.

Further reading Stanford Solar Center

Note: In 1997 the Goddard Space Flight Center issued a press release regarding a new 'Magnetic Carpet' theory.

Also see : Solar spiculesplugin-autotooltip__plain plugin-autotooltip_bigSolar spicules

"Spicules comprise one of the most fundamental components of the solar chromosphere. They appear to be jets of gas seen at the limb of the Sun in chromospheric spectral lines, and have been observed in Hα and other chromospheric spectral lines for over …

Importance Rating

    Please share this page to help promote Wikenigma !

Dear reader : Do you have any suggestions for the site's content?

Ideas for new topics, and suggested additions / corrections for older ones, are always welcome.

If you have skills or interests in a particular field, and have suggestions for Wikenigma, get in touch !

Or, if you'd like to become a regular contributor . . . request a login password. Registered users can edit the entire content of the site, and also create new pages.

( The 'Notes for contributors' section in the main menu has further information and guidelines etc.)

Automatic Translation

You are currently viewing an auto-translated version of Wikenigma

Please be aware that no automatic translation engines are 100% accurate, and so the auto-translated content will very probably feature errors and omissions.

Nevertheless, Wikenigma hopes that the translated content will help to attract a wider global audience.

Show another (random) article

Further resources :