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- W4385328214 abstract "Physical mechanism for the creation of solar spicules with three stages of their life cycle is investigated. It is assumed that at stage-I, the density hump is formed locally in the chromosphere in the presence of temperature gradients of electrons and ions along the z-axis. The density structure is accelerated in the vertical direction due to the thermal force ${bf F}_{th} propto nabla n(x,y,t) times (nabla T_e + nabla T_i)$. The exact time-dependent 2D analytical solution of two fluid plasma equations is presented assuming that the exponentially decaying density structure is created in the xy plane and evolves in time as a step function $H(t)$. The upward acceleration $a$ produced in this density structure is greater than the downward solar acceleration $g_odot$. The vertical plasma velocity turns out to be the ramp function of time $R(t)$ whereas the source term for the density follows the delta function $delta(t)$. In the transition region (TR), the temperature gradients are steeper and upward acceleration increases in magnitude $g_odot << a$ and density hump spends lesser time here. This is stage-II of its life cycle. In stage-III, the density structure enters the corona where the gradients of temperatures vanish and structure moves upward with almost constant speed which is slowly reduced to zero due to negative solar gravitational force because ${bf a} simeq - {bf g}_odot$. The estimates of height $H$ and life time $tau_l$ of the spicule are in agreement with the observed values." @default.
- W4385328214 created "2023-07-28" @default.
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- W4385328214 date "2023-07-26" @default.
- W4385328214 modified "2023-10-14" @default.
- W4385328214 title "Generation and Life Cycle of Solar Spicules" @default.
- W4385328214 doi "https://doi.org/10.48550/arxiv.2307.14328" @default.
- W4385328214 hasPublicationYear "2023" @default.
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