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      Pulsations in the Earth's Lower Ionosphere Synchronized with Solar Flare Emission

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          Abstract

          Solar flare emission at X-ray and extreme ultraviolet (EUV) energies can cause substantial enhancements in the electron density in the Earth's lower ionosphere. It is now become clear that flares exhibit quasi-periodic pulsations with timescales of minutes at X-ray energies, but to date, it has not been known if the ionosphere is sensitive to this variability. Here, using a combination of Very Low Frequency (24 kHz) measurement together with space-based X-ray and EUV observations, we report pulsations of the ionospheric D-region, which are synchronized with a set of pulsating flare loops. Modeling of the ionosphere show that the D-region electron density varies by up to an order of magnitude over the timescale of the pulsations (\(\sim\)20 mins). Our results reveal that the Earth's ionosphere is more sensitive to small-scale changes in solar soft X-ray flux than previously thought, and implies that planetary ionospheres are closely coupled to small-scale changes in solar/stellar activity.

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          Most cited references22

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          Quasi-Periodic Pulsations in Solar Flares

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            Ionization of the lower ionosphere by γ-rays from a Magnetar: Detection of a low energy (3-10 keV) component

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              A brief review of “solar flare effects” on the ionosphere

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                Author and article information

                Journal
                04 October 2017
                Article
                10.1002/2017JA024647
                1710.01725
                9fdd93d3-892e-48fc-a409-75169baaf807

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                Accepted in JGR Space Physics
                physics.space-ph astro-ph.SR

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