Mechanism of column and carrot sprites derived from optical and radio observations

Jianqi Qin, Sebastien Celestin, Victor P. Pasko, Steven A. Cummer, Matthew G. McHarg, Hans C. Stenbaek-Nielsen

    Research output: Contribution to journalArticlepeer-review

    15 Scopus citations

    Abstract

    The lightning current waveforms observed simultaneously with high-speed video records of a column and a carrot sprite event are incorporated in a plasma fluid model to provide quantitative explanation of these two distinct morphological classes of transient luminous events. We calculate the strength of the lightning-induced electric field at sprite altitudes using a time integral of the ionization frequency ∫0tνi(E/N)dt. For the studied two events, modeling results indicate that these integral values never exceed 18 in the lower ionosphere, which is the minimum value required for the initiation of streamers from single seed electrons according to the Raether-Meek criterion. It is therefore suggested that the presence of electron inhomogeneities is a necessary condition for the initiation of sprite streamers. It is further demonstrated using streamer modeling that a minimum value of the integral ∼10 is necessary to initiate upward negative streamers from inhomogeneities, corresponding to a minimum charge moment change of ∼500 C km under typical nighttime conditions. If the integral values in the entire upper atmosphere are smaller than ∼10, only column sprites can be produced, dominated by downward positive streamers. Key Points The mechanism of column and carrot sprites is derived Sprite morphology and lightning characteristics are closely related Good agreement between observations and simulations has been achieved

    Original languageEnglish (US)
    Pages (from-to)4777-4782
    Number of pages6
    JournalGeophysical Research Letters
    Volume40
    Issue number17
    DOIs
    StatePublished - Sep 16 2013

    All Science Journal Classification (ASJC) codes

    • Geophysics
    • Earth and Planetary Sciences(all)

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