Other
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.1618s&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #16.18; Bulletin of the American Astronomical Society, Vol. 31, p.852
Other
Scientific paper
It has been clear since the Skylab era that coronal heating is related to the coronal magnetic field. This may be due to the influence of magnetic field on wave heating mechanisms. It may also be due to "nanoflares," involving magnetic reconnection in the corona, as proposed by Parker and others. It is also possible that reconnection at the chromospheric level may be important. The chromosphere is a favorable site for reconnection, since the resistivity is highest in that region - specifically at the temperature-minimum location. Chromospheric reconnection can lead to coronal heating in several ways including direct Joule heating, the response of the coronal magnetic field to a sudden change in connectivity at the chromospheric level, and the generation and subsequent dissipation of high-frequency Alfven and magneto-acoustic waves. The last possibility could contribute also to the heating and propulsion of the solar wind, as suggested by Axford and others, since high-frequency waves can be dissipated by cyclotron damping. We examine some of the processes involved in a scenario for coronal heating which is based on chromospheric reconnection. We also examine a simple analytical model for the random emergence of magnetic elements within supergranulation cells, the convection of these elements into the network, and the cancellation of elements of opposite polarity within the network. This model leads to a prediction concerning the relationship between the mean coronal energy flux and the mean photospheric magnetic flux density for quiet regions. It also leads to an estimate of the rate of injection of chromospheric matter into the corona that may be compared with estimates of the rate of downflow in the transition region. This work was supported in part by NASA grants NAS 8-37334 and NAG 5-4038.
Roald Colin B.
Sturrock Peter Andrew
Wolfson Richard
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