Reports on TID activity from 23 to 25 April 2019

This topic contains 6 replies, has 4 voices, and was last updated by  cborries 5 months, 1 week ago.

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  • #4375

    annabelehaki
    Participant

    The HF interferometry method detected clear TID activity during the night of 23-24 April 2019.
    Degradation in the EGNOS performance is reported on 25 April.

    #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.

    #4377

    DavidAF
    Participant

    Se attached pdf for more details.

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    #4386

    Cris_Tim
    Participant

    Using the Along Arc TEC Rate – AATR monitor, it is observed a strong ionospheric activity (values of the index AATR greater than 1 TECU/min) in the auroral region at the end of the Day of Year (DoY) 113 (april 23th). However, it is noticeable this activity is quite concentrated on time and in the auroral region, in such a way that AATR in the subauroral receivers is quite moderated. To better illustrate these conclusions, the following plot has been generated, using data from three stations:
    – KIRU (Kiruna, Sweeden) located at 21º E, 68º N.
    – ARJ6 (Arjeplog, Sweden) located at 15º E, 66º N.
    – TRDS (Trondheim, Norway) located at 10º E, 63º N.

    For further information, please contact Miguel Juan Zornoza at miguel@fa.upc.edu

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    #4389

    annabelehaki
    Participant

    I see a strong expansion in the westward auroral electrojet around midnight of the 23 to 24 April. I attach the IL plot from the IMAGE magnetometer network. Such conditions can certainly trigger TID activity in European mid-latitudes.

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    #4391

    annabelehaki
    Participant

    Looking more on the possible TID drivers I have discovered the message below issued by the DONKI/CCMC :
    Based on preliminary heliospheric modeling carried out at NASA Community Coordinated Modeling Center/Space Weather Research Center, it is
    estimated that the CME may impact Parker Solar Probe (glancing blow) and STEREO B (glancing blow). The leading edge or flank of the CME
    will reach Parker Solar Probe at 2019-04-23T18:00Z and STEREO B at 2019-04-25T16:00Z (plus minus 7 hours).

    #4434

    cborries
    Participant

    The Large scale TID detection algrorithms based on GNSS reveal hardly any LSTID activity during 23rd to 25th Apr. 2019. TEC perturbations are detected in high latitudes during the nigths from the 23rd to 24th and 24th to 25th April. These correspond well with the AATR amplitudes presented above by Chris_Tim and they also correspond well with the auroral activity presented by Anna. There are very weak TEC perturbation signatures that can be single LSTIDs at around 3 UT on the 24th and 25th April, that follow the auroral activity. On the 25th April in the evening hours there are rather weak perturbations in the auroral region, but no LSTIDs.

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