DavidAF

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  • in reply to: Effects of the 8 of June minor storm #4504
    DavidAF
    Participant

    The attached video show the TID activity reported before.

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    in reply to: September 2017 ionospheric perturbation events #4384
    DavidAF
    Participant

    The HF-Interferometry (HF-INT) method is running in near real time at the TechTIDE project website http://techtide.space.noa.gr/?page_id=3766 since 16th April 2019. Ever since then, the HF-INT has detected several periods of activity. The method can be applied in retrospective mode to evaluate the activity of large-scale Traveling Ionospheric Disturbance (LSTIDs) in the past for Europe and South Africa. Results obtained for the Space weather occurred in September 2017 provides the following observations.

    The LSTID activity as observed by the HF-INT for 7 September of 2017 reports a dominant disturbance for all the European stations with a periodicity of about 2-h and clear southward propagation occurring in the day-time and in the evening to mid-night hours. Above the Dourbes station (DB049) in Belgium, Juliusruh (JR055) in Germany, and Ebro (EB040) in Roquetes, Spain, the disturbance was first detected on September 7 at about 8:00 UT and lasted for about 6 h. It repeated again by 20:00 and lasted for about 3 h. The disturbance in the morning propagated with an azimuth of 170º (from true north) and a velocity of about 800m/s. Stations in South Africa observe a dominant disturbance with a periodicity close to 1.5-h and clear northward propagation occurring in the evening. Above the Hermanus station (HE13N), the disturbance was first detected on September 7 at about 14:00 UT and lasted for about 6-7 h. The disturbance propagated with an azimuth of 350º (from true north) and a velocity of about 300m/s. These are typical characteristics of a LSTID whose origin might be auroral.

    A LSTID activity was also observed for 8 of September of 2017 for all the European stations occurring in early hours, as continuation of the event reported for 7 of September. After 2:00 UT, we do not observe any significant activity for the European stations. However, we should notice that data availability for European stations was not good enough for the HF-INT method, mainly caused by the presence on strong Es layers that screened F-region observations. The disturbance in the night of 7-8 September with an azimuth of 180º (from true north) and a velocity of about 400m/s. South African stations report a dominant disturbance with a periodicity of about 1.5-h and northward propagation occurring in the day-time hours. Above the Louisvale station (LV12P), the disturbance was first detected on September 8 at about 10:00 UT and lasted for about 4 h. The disturbance propagated with an azimuth of 0º (from true north) and a velocity of about 450m/s. These are typical characteristics of a LSTID whose origin might be auroral.

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    in reply to: Reports on TID activity from 23 to 25 April 2019 #4377
    DavidAF
    Participant

    Se attached pdf for more details.

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    in reply to: Reports on TID activity from 23 to 25 April 2019 #4376
    DavidAF
    Participant

    The HF-INT method is running in near real time at the TechTIDE project website (http://techtide.space.noa.gr/?page_id=3766) since 16th April 2019. Ever since then, the HF-INT has detected several periods of activity. As an example, a significant large-scale Traveling Ionospheric Disturbance (LSTID) activity was detected for the night of 23-24 April 2019.
    No strong auroral activity was observed and kp index reached values of 3. However a weak activity is observed in the satellite environment as provided by NOAA with some undulations in the magnitude of the magnetic field intensity parallel to the geomagnetic field and in the magnitude of the electron flux.
    A clear LSTID with a southward propagation was detected in Europe. Above the Ebro station (EB040) located in Roquetes, Spain, the disturbance was first detected on April 23 at about 22:00 UT and lasted for more than 4 hours. The disturbance above Europe had a period of about 110 min. and propagated with an azimuth of 180º (from true north) and a velocity of about 600m/s. These are typical characteristics of a LSTID whose origin might be auroral.

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