MINUTE OF 136th BRIEFING: 13/03/2015, 14H30

Space Weather Exhibition Room/INPE-SJC


Forecaster 1: During the last week (April 07th to 12th) it was recorded two M-class Flares. The first Flare was emitted by 2320 geo-effective region and the second Flare was emitted by 2321 region. This last active region comes in sight in the solar disk on April 12th. We observed one geo-effective coronal hole between April 11th and 12th over Southern Hemisphere. The SOHO satellite data recorded a coronal mass ejection on April 06th likely directed to the Earth.


Forecaster 2: The Enlil model data predicted two CMEs on April 09th. The ACE satellite in accordance with Enlil model recorded two shocks. It’s possible that these shocks were associated with CME observed on April 04th and 06th. The cosmic rays detectors recorded decrease over the counts on April 09th. The ACE satellite data showed that the solar wind velocity remained around 400 km/s and the Bz component decreased until -10 nT on April 11th and 12th. The radiation belt data observed by Van Allen Probes showed that the high-energy electron flux decreased from April 10th and from April 11th. The GOES satellite also recorded a decreasing in H component and electron flux during the dropouts observed by Van Allen Probes REPT instrument.


Forecaster 3: During the last week (April 07th to 12th), the geomagnetic activity was consistent with quiet day for most of the week. We observed auroral activity was intensified between April 09th and 10th. This is consistent with the Dst index (-43 nT) and Kp index (5+) observed during the same period. On April 11th, the auroral activity recorded was moderated and AE index reached 750 nT during approximately 12 hours. The Embrace magnetometer network recorded oscillations in H component during this period. The Dst index observed was -73 nT. It’s important to emphasize that this event could be associated with the period when Bz component reached -10 nT.


Forecaster 4: The ionosphere data (specifically fof2) measured on April 10th and 11th was unsettled over Fortaleza. The MUF parameter remained higher than expected during some periods. We observed that the scintillations occurrence decreased in this period, appearing from 22h00 in some of the observed days. Scintillations were not observed on April 10th and 11th. We observed plasma bubble on April 11th and 12th over São João do Cariri, only. For the other days the observations were not succeeding because of the weather conditions.

Comments are closed