Journal
TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES
Volume 24, Issue 2, Pages 243-252Publisher
CHINESE GEOSCIENCE UNION
DOI: 10.3319/TAO.2012.10.16.01(SEC)
Keywords
Interplanetary magnetic field; Solar cycle; Heliospheric current sheet; Solar anomaly
Funding
- NASA's LWS program [NNH09AM46I]
- NRL ISES program
- 6.1 program
- NSF [AGS1153323]
- NASA/EPSCor [NNx09AP74A]
- University of Alabama Huntsville Sub-Award under NASA [NNx09AP74A, SUB2010-045]
- NSF Grant
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [1153323] Funding Source: National Science Foundation
- NASA [NNX09AP74A, 111749] Funding Source: Federal RePORTER
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The unusually long-extended solar minimum between cycles 23 and 24 (from 2007 to 2008) yielded a number of anomalies with regard to solar/heliospheric phenomena wherein the solar wind magnetic field is 36% weaker than that for the previous solar cycle minimum (from 1996 to 1997) at 1 AU, the solar wind dynamic pressure is the lowest observed since the beginning of the space age, the unusually high tilted angle of the solar dipole, and the absence of a classical quiescent equatorial streamer belt. To understand the cause of the anomalies, we perform numerical simulation of a realistic inner heliosphere using a global three-dimensional, time-dependent, numerical model with observed solar inputs. It is suggested that these solar extremes are associated with (1) an inflated heliospheric current/plasma sheet (HCS/HPS) and (2) a decrease in the integrated fluxes of mass and magnetic field ejected from the Sun, which was manipulated by some unknown internal solar dynamics.
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