Minute of the 131st Briefing March 9, 2015, 14H30

Space Weather exhibition room/INPE-SJC


Forecaster 1: The week between March 2nd-9st, were recorded at least 6 M-class Flares. These Flares were able to cause blackout in the radio frequencies. It was also observed a CME associated with M-class Flare occurred at 2300 UT, on March, 7th. This Flare was emitted through an active region located in the east solar limb; therefore the possibility of this CME reach partially the Earth is approximately 50%. The Solar disc also showed a coronal hole that should be in geo-effective condition from March 11st or 12st.


Forecaster 2: ACE satellite data recorded the sector boundary crossing in March 4st. Changes in the intensity of the magnetic field, temperature and density were observed. In March 2st the velocity of the solar wind was 600 km/s. After the sector boundary crossing, the solar wind velocity remained approximately 450 km/s and the total magnetic field was oscillating around 10 nT. From the March 9st , the velocity and intensity of the magnetic field decreased, becomes compatible with solar wind values. The muons detectors at the beginning of this period showed that the cosmic rays were compatible with the occurrence of high-speed stream. High energy electron flux measured at the Radiation Belt was stable during the period.


Forecaster 3: The changes observed in the parameters of the solar wind during the sector boundary crossing showing a southern Bz orientation, were associated with several periods of the geomagnetic activity in the auroral region. The AE index was above 500 nT in several periods during this week, reached 1000 nT in some specific moments, on March 5st and 7st. The Dst index did not shown significant changes. The Kp index, on the other hand, was above 3, in the same period of the high AE index. It means attention state. The Embrace magnetometer network recorded large period oscillations in several days on this week. In all stations the intensity of this oscillations also varied.


Forecaster 4: The TEC map observed in this period is higher than others periods, as was already expected for this season. The plasma depletion was also observed in several nights. The fof2 ionospheric index was slightly higher than the expected value for March 2st. Scintillations were observed between 2230 UT and 0430 UT in several cities of the national territory. Plasma bubbles activities were observed in São João do Cariri on March 7st and Boa Vista on March 08st.

Minute translated by Ligia Da Silva.

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