The event occurred at a time of high sunspot activity during solar cycle 24. Interaction between the primary CME and the preceding CMEs as they traversed the interplanetary medium also led to amplification of the magnetic field of the ejecta that continued by the time the primary CME reached Earth's orbit. īased on the collected data, the eruption consisted of two separate ejections which were able to reach exceptionally high strength as the interplanetary medium around the Sun had been cleared by a smaller CME four days earlier. The CME travelled from the Sun to Earth's orbit in about 20.78 hours, indicating an average speed of 2,000 km/s (1,200 mi/s). The leading shock wave associated with the CME was travelling radially at a speed of around 3,300 km/s (2,100 mi/s) relative to STEREO-A by the time it reached the spacecraft. Spacecraft observations recorded the shockwave at 20:55 UTC on 23 July while the magnetic clouds arrived two hours later. The spacecraft is a solar observatory equipped to measure such activity, and because it was far away from the Earth and thus not exposed to the strong electrical currents that can be induced when a CME hits the Earth's magnetosphere, it survived the encounter and provided researchers with valuable data. The eruption tore through Earth's orbit, hitting the STEREO-A spacecraft. The CME expelled a pair of adjacent magnetic clouds that drove a fast-moving shock wave outward from the Sun. The eruption emanated from solar active region 11520 and coincided with what was at most an X2.5-class solar flare. Tightly woven, loose-fitting clothes provide additional protection from the Sun.The event occurred in 2012, near the local maximum of sunspots that can be seen in this graph.Īt 02:08 UT on 23 July 2012, a large coronal mass ejection (CME) was launched from the Sun. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. To the extent possible, limit exposure to the direct sun during these hours. The Sun's UV radiation is most powerful between 10 a.m. Fair-skinned people may get burned in less than 20 minutes. Note: In July, the average maximum UV index of 7 translate into the following recommendations: A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for ordinary individuals. UV indexThe months with the highest UV index are July and August, with an average maximum UV index of 7. SunshineJuly and August, with an average of 12.1h of sunshine, are months with the most sunshine. On the last day of July, sunrise is at 6:01 am and sunset at 7:52 pm PDT. On the first day of the month, sunrise is at 5:43 am and sunset at 8:05 pm. DaylightIn Corona, California, the average length of the day in July is 14h and 9min. In Corona, during the entire year, the rain falls for 53.9 days and collects up to 8.86" (225mm) of precipitation. Rainfall In Corona, California, during 3.8 rainfall days, 0.2" (5mm) of precipitation is typically accumulated. Humidity In Corona, the average relative humidity in July is 51%. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities. Children are often less aware of the need to rest and re-hydrate. Heat index values are especially crucial for babies and toddlers. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, wind, metabolic differences). Note: The heat index, also known as 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees. Note that heat index values are valued for light wind and location in the shade. Sustained activity may result in heatstroke. Take extra precautions, as heat cramps and heat exhaustion are possible. Heat indexIn July, the average heat index is computed to be a tropical 91.4☏ (33☌). In Corona, in July, the average low-temperature is 64.2☏ (17.9☌). TemperatureIn July, the average high-temperature slightly increases from a warm 82☏ (27.8☌) in June to a tropical 88☏ (31.1☌). July is a tropical summer month in Corona, California, with temperature in the range of an average high of 88☏ (31.1☌) and an average low of 64.2☏ (17.9☌).
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