Study of the nonradial directional property of the rays of the streamer belt and chains in the solar corona

Details Study of the nonradial directional property of the rays of the streamer belt and chains in the solar corona Study of the nonradial directional property of the rays of the streamer belt and chains in the solar corona

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002soph..208....5e&link_type=abstract

Solar Physics, v. 208, Issue 1, p. 5-16 (2002).

Physics

12

Scientific paper

Based on analyzing corona images taken by the LASCO C1, C2, and C3 instruments, a study is made of the behavior of the streamer belt spanning one half of the 1996-2001 cycle of solar activity, from minimum to maximum activity, in the absence of coronal mass ejections. It is shown that: (1) The position of the streamer belt relative to the solar equator is generally characterized by two angles: θo and θE, where θo is the latitudinal position (near the solar surface) of the middle of the base of the helmet, the top of which gradually transforms to a ray of the streamer belt with a further distance from the Sun, and θE is the latitude of this ray for R>5-6 Rsolar from the Sun's center where the ray becomes radial. (2) Only rays lying at some of the selected latitudes θo retain their radial orientation (θo~θE) throughout their extent. Namely: θo~0° (equator), θo~+/-90° (north and south poles), and the angle θo lying in the range ~+/-(65°-75°) in the N- and S-hemispheres. (3) A deviation Δθ of rays from their radial orientation in the direction normal to the surface of the streamer belt occurs: for latitudes θo<|65°-75°| toward the equator (Δθ>0°) reaching a maximum in the N and S hemispheres, respectively, when θOM~40°, and θOM~-42° for latitudes θo>|65°-75°| toward the pole (Δθ<0°). The regularities obtained here are a numerical test which can be used to assess of the validity of the theory for describing the behavior of the Sun's quasi-stationary corona over a cycle of solar activity.

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