The behavior of correlation coefficients for long-period wave disturbances (periods more than 24 hours) of the F2-layer peak electron density (NmF2) and the ionospheric total electron content (TEC) at different levels of solar and geomagnetic activity in 2003-2020 was studied. The study was based on the data from the vertical sounding ionosonde and GNSS receiver located at Irkutsk. It is shown that correlations between long-period variations in TEC and NmF2 are higher in the daytime than at night, at high solar activity compared to low, and in winter compared to summer. These differences may be caused by different contributions of the ionospheric and plasmaspheric electron content to TEC and/or synchronization of TEC and NmF2 changes by short-term (for example, 27-day) changes in solar activity.
We studied the dynamics of the GLONASS and GPS radio physical signal slips, as well as the slips in determining the total electron content (TEC) at the stations in the mid- and high-latitude regions under different geophysical conditions over 2014 Nov - 2015 Jul. At high latitudes, the pseudo-range P1 measurement slip density is shown to be lower for the GLONASS system, than that for GPS. At mid-latitudes, the TEC slip mean density (N1 TECU/min) under quiet geomagnetic conditions practically does not depend on the Kp and AE index behavior, and does not exceed 12%. At high-latitudes, N1TECU/min in winter is generally higher, than that in the summer, and may reach 50-60%. The N1 TECU/minvariation at highlatitudes correlates with the geomagnetic index behaviors; however, it depends on Kp and AE essentially differently. Under disturbed conditions, N1 TECU/min increases as AE grows more slowly, that it does under quiet conditions. On the contrary, N1 TECU/min growth as Kp increases under disturbed conditions occurs on a factor of 1,5 faster, than it does under quiet geomagnetic conditions. The N1TECU/min value dependences on the ionospheric disturbance index (Wtec) at mid- and high-latitudes are similar. An increase in the TEC slip density, N1TECU/min in wintertime occurs on a factor of 1,5 faster, than it does in summer. Simultaneously, at high-latitudes, the N1TECU/min growth with the Wtec increase occurs on a factor of 2-2,5 faster, than it does at the mid-latitudes.
We study variations of total electronic content (TEC) during typhoons, observed in the August-September 2016 in the North-West Pacific Ocean. The TEC data were obtained from phase dual-frequency measurements of GPS/GLONASS ground-based receivers. Using the indexes of ionospheric variability within different period ranges we revealed an increase in the intensity of ionospheric disturbances with periods of internal gravity waves (IGW-variability, from 2 minutes till 4 hours) at the stations located close to the typhoon regions. The most intensive variations are shown to be occurred after passage of the solar terminator and localized near the typhoon boundary. The greatest increase in TEC IGW-variability is recorded during the days of abrupt changes in the cyclones intensity (growth/fall in wind speed).
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.