TOP News

Weekend Reads: eruption in Tonga: strange "waves" in the atmosphere intrigue the scientists

Nadal, others on Djokovic saga: 'Bit tired of the situation'

  Nadal, others on Djokovic saga: 'Bit tired of the situation' MELBOURNE, Australia (AP) — Rafael Nadal's first Grand Slam match in more than seven months is on the horizon, he is coming back from a painful left foot problem that limited him to one tournament over the last half of last season and he got COVID-19 in December. Plenty to talk about, right? This is, after all, the owner of 20 major championships and one of the most significant figures in the history of tennis. His mere presence at an Australian Open pre-tournament news conference Saturday was newsworthy — or, rather, would have been on pretty much any other occasion.

L’éruption du volcan Hunga Tonga-Hunga Ha’apai, une des plus puissantes des dernières décennies, a été ressentie jusqu'en France. NASA/NOAA / AFP © Valery Ax The eruption of the Hunga Tonga-Hunga Ha'apai volcano, one of the most powerful in recent decades, was felt until in France. NASA / NOAA / AFP "It's really unique. We never saw anything like this in the data before, "went out of the Lars Hoffmann atmosphere specialist in the Nature magazine. A series of massive corrugations in the terrestrial atmosphere, triggered by the eruption of the Tongien volcano this weekend , leaves the perplexed researchers. On satellite images we can indeed see strange circles that extend around the place of the disaster, in the hours that followed the eruption of the Hunga Tonga-Hunga Ha'apai volcano on January 14. According to the scientific journal, the images come from the atmospheric infrared sounder (tunes), mounted on the Aqua satellite of NASA. These waves were allegedly provoked by scientists, by the shock wave when the volcano eruption and would probably make the globe several times several times. "Atmospheric gravity waves occur when the air molecules in the atmosphere are disturbed vertically, rather than horizontally, in the air column," explained the scientific journal. "The specialists evoke a big bubble of hot air that would be mounted in the atmosphere, and who would have somehow overthrown the air," said the microphone of France Info Mathilde Mandate, editor-in-chief of the Epsiloon scientific magazine . These strange ripples in the atmosphere would have been caused by the rapid ascending current of hot air and ashes of the eruption volcano. But this is the first time that the tune instrument, launched in May 2002, records such a phenomenon during an eruption. Considerable damage Despite this scientific curiosity that excites scientists, the eruption of the Hunga Tonga-Hunga Ha'apai volcano, one of the most powerful in recent decades, has killed at least one person . It was felt until France , and even in the American state of Alaska, and triggered a tsunami which flooded the coasts of the United States to Chile and Japan. Ashes and acid rain fell on a large part of the Pacific, causing considerable damage . The Tongien government described this "unprecedented disaster" event and declared an emergency situation for about a month.

COVID-19: The three checkboxes to lift all sanitary restrictions .
© Pascal Pochard-Casabianca / AFP Will France follow the same path as Denmark? Will she raise her sanitary restrictions from February 1st or in the coming days? Professor Antoine Flahault, epidemiologist and director of the Geneva Global Health Institute was the guest of Europe Midi Thursday to evoke this potential decision. The Denmark , which knows how France a record number of contaminations at COVID-19, lifts sanitary restrictions from February 1st.

See also