Yesterday was geomagnetically fairly quiet overall, but there were some minor disturbances, taking the field to a peak Kp ~3. Out of all the possible magnetometer stations, the Norwegian line cluster (Z component) displays the clearest summary of the day:
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| Image: Tromso Geophysical Laboratory |
The spots of LU8DPV looked like this, which is quite different from what we have seen over the past few, geomagnetically quiet days:
The very small northerly pulse in the field at around 16-17UT seems to have some association with the signal from LU8DPV. Certainly, the Looking at the timing of these pulses as recorded from east to west, I can see (the single plot for the E-W line is not currently working), that the Norwegian line variations are in much better, and very good agreement with the variations in LU8DPV's signal than lines further to the west, such as Greenland. Iceland fails to show the disturbances in any detail, as it is directly under the oval at all times on this particular day.
The recovery of LU8DPV at around 20:30UT seems to be coincident with the field moving south through the mean quiet conditions level. A further, and much larger southerly deviation keeps spot strengths low, until the field moves rapidly north, relaxing to quiet conditions just before UT midnight. By then, the area of influence has moved towards Greenland, where the field restoration is in good agreement with the changes in LU8DPV's spots:
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| 2019 January 14-15, Greenland East line. Image: TGO. |
1 comment:
I don't know how much the geomagnetic field has a influence on 40m? But just before the incoherent peak spot at 14:50-15:50UT I was spotted in Tasmania VK7JJ and Australia VK2RAS/4. I can't explain those spots since we are in bright daylight and they are in darkness. Normally this isn't possible on 40m I thought. Except just before or after a greyline, but that is not the case at both locations. 73, Bas
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