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<p>One of the many outcomes of the Solar Orbiter mission is the evidence for the solar atmosphere being filled by highly impulsive bursts, down to ≈ 200&#xa0;<InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">km</mi> </math></EquationSource> <EquationSource Format="TEX">$\mathrm{km}$</EquationSource> </InlineEquation> scale: the limit of the spatial resolution of EUV instruments. Small-scale events of this kind were already known, but their observation was occasional or with limited, lower resolution. Solar Orbiter has revealed that small-scale, highly impulsive events are everywhere on the quiet Sun, all the time, at even smaller scales. Their similarities with known larger features, are the witnesses that the physical processes causing them are independent of the spatial scales involved. Their highly dynamic property is the signature of energy transfer and/or local dissipation. Their investigation can thus elucidate on the dominant physical processes acting on the solar atmosphere and on the possible role in the origin of the hot solar corona.</p><p>In this review, we will present a summary of the observational and simulation results on this topic, led by the results from data taken by the Extreme Ultraviolet Imager (EUI)/High Resolution Imagers (HRI<sub>EUV</sub>) instrument. Here, we will cover both statistical properties and analyses of individual events.</p>

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Small EUV Brightenings in the Quiet Solar Atmosphere: New Insights from the Solar Orbiter Mission

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Susanna Parenti

摘要

One of the many outcomes of the Solar Orbiter mission is the evidence for the solar atmosphere being filled by highly impulsive bursts, down to ≈ 200  km $\mathrm{km}$ scale: the limit of the spatial resolution of EUV instruments. Small-scale events of this kind were already known, but their observation was occasional or with limited, lower resolution. Solar Orbiter has revealed that small-scale, highly impulsive events are everywhere on the quiet Sun, all the time, at even smaller scales. Their similarities with known larger features, are the witnesses that the physical processes causing them are independent of the spatial scales involved. Their highly dynamic property is the signature of energy transfer and/or local dissipation. Their investigation can thus elucidate on the dominant physical processes acting on the solar atmosphere and on the possible role in the origin of the hot solar corona.

In this review, we will present a summary of the observational and simulation results on this topic, led by the results from data taken by the Extreme Ultraviolet Imager (EUI)/High Resolution Imagers (HRIEUV) instrument. Here, we will cover both statistical properties and analyses of individual events.