MINUTE OF 138th BRIEFING: 04/05/2015, 14H30

Space Weather Exhibition Room/INPE-SJC


Forecaster 1: During the Last week (April 28th to May 4th) was observed two coronal holes. The first CH665 was geo-effective on May 02nd and the second was located over Southern Hemisphere. We observed a CME directed to Earth on May 2nd. The community estimated that this CME would arrive on May 6th. The region 2335 with complexity Beta/Gama is located on the central part of the solar disc, it has the probability to evaluate in complexity.


Forecaster 2: During this week the solar wind parameters were compatible with slow solar wind (approximately 300km/s). We observed an increase in density on April 28th followed by an increasing of the velocity on May 1st. The velocity reached 450 km/s and was caused by the presence of the high-speed stream. The interplanetary magnetic field was considered perturbed at the beginning of  April 30th, however the Bz component remained oscillating around +/- 5nT. It is predicted that CME would arrive on May 6th. The parameters of the interplanetary medium in this week were compatible with nominal values observed. The electron-flux measured by Van Allen Probes remained stable during all week.


Forecaster 3: During this week the geomagnetic activity was consistent with quiet day for most of the time. Thereby, we observed localized instabilities in some specifics periods. The Dst index remained oscillating around the zero during all period. This pattern observed on the geomagnetic field is a consequence of the quiet solar wind.


Forecaster 4: The ionosphere data for this week was consistent with quiet day and solar conditions. We didn’t observe the plasma bubble and scintillations. TEC intensity over Brazilian map was significantly low along of the day.

Minute translated by Ligia Alves da Silva.

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