Influence of solar activity variations on interdiurnal variability of NmE obtained from ground-based low latitude ionosonde data in geomagnetically quiet conditions

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The study of the interdiurnal variations in the statistical characteristics of the electron number density NmE of the ionospheric E layer peak for each month M of the year in geomagnetically quiet conditions at low and moderate solar activity was carried out based on hourly measurements of the critical frequency of the E layer of the Huancayo and Jicamarca ionosondes from 1957 to 1989 and 1998–2006, respectively. The authors have calculated the mathematical expectation NmEE(UT,M), NmEA(UT,M) arithmetic mean, the standard deviation σE(UT,M) and the variation coefficient CVE(UT,M) of NmE(UT,M) from NmEE(UT,M), respectively, where UT is the universal time. The calculations showed that the value of CVE(UT,M) that determines the relative interdiurnal NmE variability vary between 4–14 and 3–18% at low and moderate solar activity, respectively. It was found for the first time that the interdiurnal variability of NmE can either increase or decrease when solar activity changes from low to moderate levels. In the first case, the increase in σE(UT,M) prevails over the growth of NmEE(UT,M), in the second case, the growth of NmEE(UT,M) prevails over the increase in σE(UT,M).

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A. Pavlov

Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation of the Russian Academy of Sciences (IZMIRAN)

编辑信件的主要联系方式.
Email: pavlov@izmiran.ru
俄罗斯联邦, Moscow, Troitsk

N. Pavlovа

Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation of the Russian Academy of Sciences (IZMIRAN)

Email: pavlov@izmiran.ru
俄罗斯联邦, Moscow, Troitsk

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2. Fig. 1. Expressed as a percentage of the NmE dependence of the probability P(UT,M) for low solar activity conditions at 17:00 UT (11:59 SLT). The solid and dashed curves correspond to January and February (upper left panels), March and April (middle left panels), May and June (lower left panels), July and August (upper right panels), September and October (middle right panels), November and December (lower right panels).

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3. Fig. 2. Expressed as a percentage of the dependence on NmE of the probability P(UT,M) for conditions of moderate solar activity at 17:00 UT (11:59 SLT). The designations of the curves are the same as in Fig. 1.

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4. Fig. 3. Dependence of the CVE(UT,M) coefficient on the month of the year for low solar activity conditions at 06:59, 07:59, and 08:59 SLT (solid, dashed, and dotted curves in the upper left panel, respectively); 09:59, 10:59, and 11:59 SLT (solid, dashed, and dotted curves in the lower left panel, respectively); 12:59, 13:59, and 14:59 SLT (solid, dashed, and dotted curves in the upper right panel, respectively); 15:59 and 16:59 SLT (solid and dashed curves in the lower right panel, respectively).

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5. Fig. 4. Dependence of the coefficient CVE(UT,M) on the month of the year for conditions of moderate solar activity. The designations of the curves are the same as in Fig. 3.

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6. Fig. 5. Dependence of the parameter ∆ CVE(UT,M) on time for each month of the year.

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7. Fig. 6. Dependence of the parameters R1(UT,M) and R2(UT,M) on time from January to June. Solid and dashed curves correspond to R1(UT,M) and R2(UT,M).

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8. Fig. 7. Dependence of the parameters R1(UT,M) and R2(UT,M) on time from July to December. Solid and dashed curves correspond to R1(UT,M) and R2(UT,M).

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