Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...524l..75s&link_type=abstract
The Astrophysical Journal, Volume 524, Issue 1, pp. L75-L78.
Astronomy and Astrophysics
Astronomy
15
Sun: Corona, Sun: Magnetic Fields, Sun: X-Rays, Gamma Rays
Scientific paper
According to recent data analyses, the relationship between the coronal energy flux density and the photospheric magnetic flux density is approximately power law; estimates of the exponent tend to be noninteger and fall in the range 1-2. The index is closer to 2 for quiet regions and closer to 1 for active regions. We here examine this relationship on the basis of a recent model of coronal heating. We assume that the coronal energy flux is derived from reconnection of neighboring flux tubes at the level of the chromosphere, and we examine the rate at which such reconnection would occur in terms of a simple kinetic-theory model. In this model, flux elements appear randomly within supergranulation cells, are carried into the network according to a prescribed velocity field, and cancel in the network due to ``collisions'' between elements of opposite polarity. For any limited range of magnetic flux density, the relationship is approximately power law. We find that the power-law index is in the range 1-2: for weak fields it is close to 2, and for strong fields it is close to 1, in agreement with available evidence.
Roald Colin B.
Sturrock Peter Andrew
Wolfson Richard
No associations
LandOfFree
Chromospheric Magnetic Reconnection and its Implication for Coronal Heating does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Chromospheric Magnetic Reconnection and its Implication for Coronal Heating, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chromospheric Magnetic Reconnection and its Implication for Coronal Heating will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1084103