Evidence for solar wind modulation of lightning

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Video in TIB AV-Portal: Evidence for solar wind modulation of lightning

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Evidence for solar wind modulation of lightning
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The response of lightning rates over Europe to arrival of high speed solar wind streams at Earth is investigated using a superposed epoch analysis. Fast solar wind stream arrival is determined from modulation of the solar wind V y component, measured by the Advanced Composition Explorer spacecraft. Lightning rate changes around these event times are determined from the very low frequency arrival time difference (ATD) system of the UK Met Office. Arrival of high speed streams at Earth is found to be preceded by a decrease in total solar irradiance and an increase in sunspot number and Mg II emissions. These are consistent with the high speed stream's source being co-located with an active region appearing on the Eastern solar limb and rotating at the 27 d period of the Sun. Arrival of the high speed stream at Earth also coincides with a small (~1%) but rapid decrease in galactic cosmic ray flux, a moderate (~6%) increase in lower energy solar energetic protons (SEPs), and a substantial, statistically significant increase in lightning rates. These changes persist for around 40 d in all three quantities. The lightning rate increase is corroborated by an increase in the total number of thunder days observed by UK Met stations, again persisting for around 40 d after the arrival of a high speed solar wind stream. This result appears to contradict earlier studies that found an anti-correlation between sunspot number and thunder days over solar cycle timescales. The increase in lightning rates and thunder days that we observe coincides with an increased flux of SEPs which, while not being detected at ground level, nevertheless penetrate the atmosphere to tropospheric altitudes. This effect could be further amplified by an increase in mean lightning stroke intensity that brings more strokes above the detection threshold of the ATD system. In order to remove any potential seasonal bias the analysis was repeated for daily solar wind triggers occurring during the summer months (June to August). Though this reduced the number of solar wind triggers to 32, the response in both lightning and thunder day data remained statistically significant. This modulation of lightning by regular and predictable solar wind events may be beneficial to medium range forecasting of hazardous weather.

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in a in a room where there are also known for its apparent specialist on a day like today that the sun is a
major influence on whether there are subtle secondary effects he got into space you can see the sun is this fireable of plasma
and it rotates once every 27 days with respect to give you can also see that this
material coming at the Sundance the so the streaming with from some about 400 to 800 kilometers a 2nd and as the sun rotates these
jets of fast and slow you so the wind washed past via the at 6 in the sun that so it shouldn't be surprising that the sum of the solar wind influence our planet we know that it does to some extent because we have a beautiful phenomena that is the horrible realities that's the the northern and southern lights
and that's caused by standards particles and penetrating insight on their we show this as 1 of the
streams washes past the brings with it a population of energetic particles that penetrate the atmosphere and here to help modulate
lining of the of the accepted wisdom
is that it's cosmic ray of these of very energetic particles calls by a supernova explosions these very energetic particles on names
penetrate the atmosphere electrified the gas and its bolts trigger like
when the sun's very active it has a
stronger so the wings and a much stronger magnetic field its place in this magnetic field protects we're from many of these calls it right so you would expect when the
sum that you have fewer cosmic rays and therefore less likely what we're seeing on much shorter time scales is with an active son and 1 of the streams sweeping past the to have an enhancement in life because although you have got an enhancement in the local magnetic field coming with that a hole in the population of energetic particles which are doing the same job we think this is because right know this has potential applications because we have studied are staff from space for a number of decades now we know that it rotates once every 27 days and we can see where these fast and slow streams of caring is a
potentially we can predict when they arrive
at that if we can understand the influence of the sediment streams on lightning writes in more detail understanding practices and that potentially leads to the possibility of of some kind of long-term
forecasting of the severity of light and