Which Component of Solar Magnetic Field Drives the Evolution of Interplanetary Magnetic Field over the Solar Cycle?
نویسندگان
چکیده
Abstract The solar magnetic structure changes over the cycle. It has a dipole during minimum, where open flux extends mainly from polar regions into interplanetary space. During maximum, complex is formed with low-latitude active and weakened fields, resulting in spread field regions. However, components of that are responsible for long-term variations (IMF) not clear, IMF strength estimated based on known to be underestimated by factor 3–4 against actual situ observations (the problem). To this end, we decomposed coronal spherical harmonic function degree order ( ℓ , m ) using potential source surface model synoptic maps SDO/HMI 2010–2021. As result, found rapidly increased 2014 December (7 months after maximum), which coincided increase equatorial dipole, = (1, ±1), corresponding diffusion toward poles longitudinal direction. gradually decreased until 2019 (solar minimum) its variation corresponded nondipole component ≥ 2. Our results suggest understanding problem may improved focusing influence less significant.
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2023
ISSN: ['2041-8213', '2041-8205']
DOI: https://doi.org/10.3847/1538-4357/acd053