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http://hdl.handle.net/2122/14002
Authors: | Perrone, Loredana* Mikhailov, Andrey V* Nusinov, Anatoly A* |
Title: | Daytime mid-latitude F2-layer Q-disturbances:A formation mechanism | Journal: | Scientific Reports | Series/Report no.: | /10 (2020) | Publisher: | Nature P.G. | Issue Date: | 2020 | DOI: | 10.1038/s41598-020-66134-2 | Abstract: | Negative and positive near noontime prolonged (>= 3hours) F-2-layer Q-disturbances with deviations in NmF2>35% occurred at Rome have been analyzed using aeronomic parameters inferred from f(p180) (plasma frequency at 180km height) and f(o)F(2) observations. Both types of NmF2 perturbations occur under quiet (daily Ap < 15 nT) geomagnetic conditions. Day-to-day atomic oxygen [O] variations at F-2-region heights specify the type (positive or negative) of Q-disturbance. The [O] concentration is larger on positive and is less on negative Q-disturbance days compared to reference days. This difference takes place not only on average but for all individual Q-disturbances in question. An additional contribution to Q-disturbances formation is provided by solar EUV day-to-day variations. Negative Q-disturbance days are characterized by lower h(m)F(2) while positive - by larger h(m)F(2) compared to reference days. This is due to larger average Tex and vertical plasma drift W on positive Q-disturbance days, the inverse situation takes place for negative Q-disturbance days. Day-to-day changes in global thermospheric circulation may be considered as a plausible mechanism. The analyzed type of F-2-layer Q-disturbances can be explained in the framework of contemporary understanding of the thermosphere-ionosphere interaction based on solar and geomagnetic activity as the main drivers. |
Appears in Collections: | Article published / in press |
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s41598-020-66134-2 (1).pdf | 1.12 MB | Adobe PDF | View/Open |
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