Formation of coronal loops with temperatures between 10^5^ and 10^6^K.

Details Formation of coronal loops with temperatures between 10^5^ and 10^6^K. Formation of coronal loops with temperatures between 10^5^ and 10^6^K.

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...305..649b&link_type=abstract

Astronomy and Astrophysics, v.305, p.649

Astronomy and Astrophysics

Astrophysics

8

Sun: Corona Of, Sun: Uv Radiation, Mhd

Scientific paper

Loops and arcs of plasma with temperatures in the range 10^5^ to 10^6^K are a prominent feature of X-ray and ultraviolet images of the solar corona above active regions. Existing static loop models, which successfully describe the physical conditions in loops with temperatures above 10^6^K, require much lower densities than are observed in these cooler loops. Levine & Withbroe (1977) and Raymond & Foukal (1982) have proposed that these loops are cooling hot loops. Using a numerical model appropriate for active region coronal loops, we investigate how the loop parameters affect the evolution of cooling loops. For loops to form in the temperature range 10^5^ to 10^6^K with densities comparable to observed loops, we find that the loop heating must fall to less than 10% of the initial heating in times of the order of the conductive cooling time for the loop, pL^2^/κ_0_T^7/2^. The heating must then remain at this lower level for up to an hour or more. During this time, the initially hot coronal loops cool gradually from temperatures around 210^6^K to temperatures below 10^6^K. The minimum temperature reached depends on the magnitude of the heating reduction but can be as low as 10^5^K.

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