These dramatic "keraunographic" marks are sometimes referred to as "lightning flowers" or "lightning trees. If you are self-conscious about your spider veins, or if they become painful or tender, see your doctor about the possibility of treatment.If you decide on cosmetic treatment for your spider veins, you can expect a 50% to 90% improvement.
The best studied and understood form of lightning is cloud to ground (CG). Objects struck by lightning experience heat and magnetic forces of great magnitude. Researchers believe that various factors may result in spider nevi. Of the three primary types of lightning, it poses the greatest threat to life and property since it terminates or "strikes" the Earth. At the latitude of Norway (around 60° North latitude), where the freezing elevation is lower, 50% of lightning is CG.The place on Earth where lightning occurs most often is near the small village of It is well understood that during a thunderstorm there is charge separation and aggregation in certain regions of the cloud; however, the exact processes by which this occurs are not fully understood. Despite the popular misconception that these are positive lightning strikes due to them seemingly originating from the positive charge region, observations have shown that these are in fact negative flashes.
The rate at which the return stroke current travels has been found to be around 100,000 km/s.The massive flow of electric current occurring during the return stroke combined with the rate at which it occurs (measured in microseconds) rapidly High-speed videos (examined frame-by-frame) show that most negative CG lightning flashes are made up of 3 or 4 individual strokes, though there may be as many as 30.Each re-strike is separated by a relatively large amount of time, typically 40 to 50 milliseconds, as other charged regions in the cloud are discharged in subsequent strokes. They may make you feel self-conscious, but they are harmless, and any treatment is usually done for cosmetic reasons only.
Diagnosis 545–576 in Kasemir, H. W. (1950) "Qualitative Übersicht über Potential-, Feld- und Ladungsverhaltnisse bei einer Blitzentladung in der Gewitterwolke" (Qualitative survey of the potential, field and charge conditions during a lightning discharge in the thunderstorm cloud) in V. Cooray, Mechanism of the Lightning Flash, in: The Lightning Flash, 2nd ed., V. Cooray (Ed. Bite & Venom Though their bite may be as painful as a pinprick up to a bee sting, the venom may cause numbness, but is not usually dangerous to humans. The larger and denser graupel is either suspended in the middle of the thunderstorm cloud or falls toward the lower part of the storm.The result is that the upper part of the thunderstorm cloud becomes positively charged while the middle to lower part of the thunderstorm cloud becomes negatively charged.The upward motions within the storm and winds at higher levels in the atmosphere tend to cause the small ice crystals (and positive charge) in the upper part of the thunderstorm cloud to spread out horizontally some distance from the thunderstorm cloud base. The heat created by lightning currents traveling through a tree may vaporize its sap, causing a steam explosion that bursts the trunk.
Spider veins usually do not cause any symptoms, but rarely may cause a mild dull discomfort or burning sensation.Your health care professional can diagnose spider veins by looking at them.
Many people believe heat lightning is produced by hot and humid conditions, lighting up the night sky without any rain or thunder in the immediate area.
There are three primary types of lightning, defined by what is at the "ends" of a flash channel.
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What is more important, however, is diagnosing the underlying cause and ruling out certain conditions that may have produced the vessel clusters.You will be asked about hormone supplements and any other medications you are taking.
If the plane is below the cloud, then a CG flash could result.The more common cloud-to-ground flash has a negative stepped leader that travels downward through the cloud, followed by an upward traveling return stroke.
Credit: John Jensenius .
Less commonly, a downward traveling positive leader followed by an upward return stroke will lower positive charge to earth, referred to as a positive CG (or +CG).
Since the base of a thunderstorm is usually negatively charged, this is where most CG lightning originates. Spider nevi may be a sign of liver disease. Artificially initiated lightning is associated with things like very tall structures, rockets and towers. Upward triggered lightning usually occurs in response to a natural lightning flash, but on rare occasions can be “self-triggered”—usually in winter storms with strong winds.
This pain occurs most commonly when the vessels are in the legs, and after a long period of standing.Spider nevi are usually not cause for concern if you don’t have any other symptoms or health conditions.
If you are predisposed to this condition due to family history and genetics, you’re likely to get spider nevi no matter what you do.
Avil Crawler is yet another name used for describing Spider Lightning. In some cases, a ground to cloud (GC) lightning flash may originate from a positively charged region on the ground below a storm. We comply with the HONcode standard for trustworthy health information - The updraft carries the positively charged ice crystals upward toward the top of the storm cloud.