{"id":72674,"date":"2021-06-08T03:00:24","date_gmt":"2021-06-08T01:00:24","guid":{"rendered":"https:\/\/www.cde.ual.es\/?p=72674"},"modified":"2021-09-07T12:53:10","modified_gmt":"2021-09-07T10:53:10","slug":"the-curious-incident-of-swarm-and-sprites-in-the-night-time","status":"publish","type":"post","link":"https:\/\/www.cde.ual.es\/en\/the-curious-incident-of-swarm-and-sprites-in-the-night-time\/","title":{"rendered":"The curious incident of Swarm and sprites in the night-time"},"content":{"rendered":"
\n

We are all familiar with the bolts of lightning that accompany heavy storms. While these flashes originate in storm clouds and strike downwards, a much more elusive type forms higher up in the atmosphere and shoots up towards space. So, what are the chances of somebody taking photographs of these rarely seen, brief \u2018transient luminous events\u2019 at the exact same time as a satellite orbits directly above with the event leaving its signature in the satellite\u2019s data?<\/p>\n<\/div>\n

\n

The likelihood of this happening might seem pretty remote, but, remarkably, an observer for the Czech Institute of Atmospheric Physics who is also an avid \u2018lightning hunter\u2019 has taken photographs of these transient luminous events that not only coincide with measurements taken by ESA\u2019s Swarm satellite mission, but also with recordings taken from the ground.<\/p>\n

This extraordinary three-way coincidence is leading to better insight into how this type of lightning propagates into space. In addition, these new findings could potentially improve scientific models of the ionised part of Earth\u2019s upper atmosphere \u2013 the ionosphere.<\/p>\n<\/div>\n

\n
\"Sprite<\/figure>\n

Transient luminous events are optical phenomena that occur high up in the atmosphere and they are linked to electrical activity in underlying thunderstorms. They are very brief, lasting from less than a millisecond to two seconds, and rarely seen from the ground. They are usually only captured by sensitive photographic equipment and, because they emit weak light, photographs can only be taken at night.<\/p>\n

There are several different types of transient luminous events such as sprites, jets and elves, each with their own characteristics.<\/p>\n

Sprites, for example are large electrical discharges that occur at an altitude of around 50\u201390 km, above large thunderstorm systems. They appear as large, but weak flashes of red and usually happen at the same time as the cloud-to-ground lightning we all know.<\/p>\n

Scientists have long been interested in understanding if lightning propagating to higher in the ionosphere can cause fluctuations in Earth\u2019s magnetic field. The ionosphere is very active part of the atmosphere, responding to the energy it absorbs from the Sun. Gases in the ionosphere are excited by solar radiation to form ions, which have an electrical charge.<\/p>\n<\/div>\n

\n

A\u00a0paper<\/a>, published recently in\u00a0Geophysical Research Letters<\/i>, describes how scientists from research centres in Poland used magnetic field data from ESA\u2019s constellation of Swarm satellites, lightning observations from the\u00a0Geostationary Lightning Mapper<\/a>\u00a0and from the ground-based\u00a0World Extremely Low Frequency Radiolocation Array (WERA)<\/a>\u00a0to provide evidence of links between transient luminous events and magnetic-field fluctuations in the upper ionosphere.<\/p>\n

Ewa Slominska, from a small company cooperating with Poland\u2019s Space Research Centre, explained, \u201cLightning can generate ultralow frequency fluctuations that leak into the upper ionosphere. This means that some lightning bolts are so powerful that they trigger disturbances in Earth’s magnetic field and propagate hundreds of kilometres upwards from the thunderstorm, reaching the altitude of Swarm\u2019s orbit.<\/p>\n

\u201cAlthough Swarm\u2019s main goal is to measure slow changes in the magnetic field, it is apparent that the mission can also detect fast fluctuations in the field. However, Swarm can only do this if one of the satellites is in close proximity to the active thunderstorm and if the lightning is strong enough.\u201d<\/p>\n<\/div>\n

\n

Janusz Mlynarczyk, from AGH University of Science and Technology in Krakow, added, \u201cUsing the three stations of the WERA system, we are able to locate powerful atmospheric discharges that occur anywhere on Earth and reconstruct their most important physical parameters. This is possible because of a very low attenuation of Extremely Low Frequency (ELF) electromagnetic waves that these discharges generate.<\/p>\n

\u201cPowerful ELF waves can even propagate around the world a few times and still be visible in our recordings. Such powerful sources include sprite-associated discharges. The accumulated electrostatic energy released and observed by Swarm was close to 120 GJ, which is equivalent to the energy released in the detonation of 29 tonnes of TNT.<\/p>\n

\u201cAlthough we know that every lightning strike carries a lot of energy, it is clear that this class of lightning is much more powerful. A single bolt of ordinary lightning, which is invisible to Swarm\u2019s instruments, carries enough energy to charge 20 electric cars, but the energy produced by a transient luminous event would be enough to charge more than 800 vehicles.\u201d<\/p>\n<\/div>\n

\n
\"Sprites<\/a><\/figure>\n

A remarkable aspect to all of this is that one of the scientific team members, Martin Popek, is passionate about capturing sprites, jets and elves on camera. His photographs are proving a very valuable to the team\u2019s research as they have coincided with measurements taken by Swarm and by the ground array.<\/p>\n

ESA\u2019s Swarm mission scientist, Roger Haagmans, commented, \u201cIt\u2019s astonishing that Martin manages to capture such fleeting events on camera, but what\u2019s really remarkable is that his dedication to this kind of photography has coincided with measurements from our Swarm mission. His photos add another dimension to the research and we are certainly reaping the benefits of his commitment to hanging outside in the cold and dark!\u201d<\/p>\n

More information<\/h3>\n

The European Space Agency – Press Release<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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