MINUTE OF 135th BRIEFING: 06/03/2015, 14H30

Space Weather Exhibition Room /INPE-SJC


Forecaster 1: During the last weak (March 31st to April 6th) were recorded some B and C-class Flares. We observed a trans-equatorial coronal hole (CH661) that was geo-effective from March 30th. A second coronal hole CH662 observed was not geo-effective in this week, it is estimated that it will become geo-effective from April 8th or 9th. The SOHO satellite data recorded a CME without the possibility to identify its direction.


Forecaster 2: The Enlil model data predicted a sector boundary crossing during the presence of the high-speed stream. The ACE satellite data recorded a shock in March 31st, observed by the enhancement of the solar wind velocity from 350 km/s to 400 km/s. The sector boundary crossing was also observed as predicted by Enlil model. The magnetic field of interplanetary components have changed due to the presence this solar structure. The neutrons detectors data recorded over Northern and Southern Hemisphere in March 31st showed different signals for magnetic field structure configuration of the solar wind. After this event, the satellite ACE data recorded a gradual increase of the solar wind velocity between April 01st and 04th. This situation indicates the presence of the high-speed stream that is consistent with Enlil model. The outer radiation belt observed by Van Allen probes showed that the high-energy electron flux between March 23rd and April 04th was consistent with the oscillations observed on the Magnetosphere. Thereby, we observed a dropout from March 29th located only from L*=5.


Forecaster 3: During this week the geomagnetic activity was consistent with quiet day for most of the week. The Embrace Magnetometer Network recorded in March 31st a shock over almost all stations. This impact observed above presumably was associated with the occurrence of the sector boundary crossing.


Forecaster 4: The ionosphere data presented consistent pattern with quiet day. The network stations responsible for TEC map data presented significant diary variability before and after April 02nd. In April 02nd was not observed scintillations. We verified that the scintillations have been initiated around 2000 LT. We observed plasma bubble in March 30th over São João do Cariri. For the other days the observations was not possible because of the weather conditions and the lunar phase.

Minute translated by Ligia Alves da Silva

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