Solar wind ion trends and signatures: STEREO PLASTIC observations approaching solar minimum

被引:11
|
作者
Galvin, A. B. [1 ]
Popecki, M. A. [1 ]
Simunac, K. D. C. [1 ]
Kistler, L. M. [1 ]
Ellis, L. [1 ]
Barry, J. [1 ]
Berger, L. [2 ]
Blush, L. M. [3 ]
Bochsler, P. [1 ,3 ]
Farrugia, C. J. [1 ]
Jian, L. K. [4 ]
Kilpua, E. K. J. [5 ]
Klecker, B. [6 ]
Lee, M. [1 ]
Liu, Y. C. -M. [1 ]
Luhmann, J. L. [7 ]
Moebius, E. [1 ]
Opitz, A. [8 ]
Russell, C. T. [4 ]
Thompson, B. [9 ]
Wimmer-Schweingruber, R. F. [6 ]
Wurz, P. [3 ]
机构
[1] Univ New Hampshire, Durham, NH 03824 USA
[2] Univ Kiel, Inst Expt & Appl Phys, Kiel, Germany
[3] Univ Bern, Bern, Switzerland
[4] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA
[5] Univ Helsinki, Div Theoret Phys, Dept Phys, FIN-00014 Helsinki, Finland
[6] Max Planck Inst Extraterr Phys, D-85741 Garching, Germany
[7] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
[8] UPS, CNRS, Ctr Etud Spatiale Rayonnements, F-31028 Toulouse, France
[9] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
关键词
Interplanetary physics; Solar wind plasma; Sources of the solar wind; COROTATING INTERACTION REGIONS; STREAM INTERFACES; CORONAL HOLES; PLASMA; FLOWS;
D O I
10.5194/angeo-27-3909-2009
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
STEREO has now completed the first two years of its mission, moving from close proximity to Earth in 2006/2007 to more than 50 degrees longitudinal separation from Earth in 2009. During this time, several large-scale structures have been observed in situ. Given the prevailing solar minimum conditions, these structures have been predominantly coronal hole-associated solar wind, slow solar wind, their interfaces, and the occasional transient event. In this paper, we extend earlier solar wind composition studies into the current solar minimum using high-resolution (1-h) sampling times for the charge state analysis. We examine 2-year trends for iron charge states and solar wind proton speeds, and present a case study of Carrington Rotation 2064 (December 2007) which includes minor ion (He, Fe, O) kinetic and Fe composition parameters in comparison with proton and magnetic field signatures at large-scale structures observed during this interval.
引用
收藏
页码:3909 / 3922
页数:14
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