Ripples are impressed upon the clouds by gravity waves propagating up to the mesosphere from storms near Earth's surface. However, two factors suggest it is: First, the very fine ripples in Bardelli's photo are typical of NLCs.

'I wasn't absolutely sure that this was an NLC,' says Bardelli. Paolo Bardelli sends this picture from Vegonno at latitude +45N: Last night in Europe, observers saw noctilucent clouds (NLCs) as far south as Italy. This could be the CME from last Tuesday's X1-flare it was expected to miss with a slight chance of minor contact on June 24th. The near miss opened a crack in Earth's magnetosphere and sparked a minor G1-class geomagnetic storm. Solar wind data suggest that a CME passed close to Earth on June 24th around 1900 UT. 28, 2023, as a show of thanks for years of service and hope for future daisies: Until then, we will maintain AIM's iconic 'daily daisy,' frozen at Feb. There may be some hope of a recovery as AIM's orbit precesses into full sunlight in 2024. As a result AIM is offline, perhaps permanently. What happened to NASA's AIM spacecraft, which has been monitoring NLCs since 2007? Earlier this year, the spacecraft's battery failed. As the season progresses, these dots will multiply in number and shift in hue from blue to red as the brightness of the clouds intensifies. For the rest of the season, daily maps from NOAA 21 will be presented here:Įach dot is a detected cloud. An instrument onboard NOAA 21 ( OMPS LP) is able to detect NLCs (also known as 'polar mesospheric clouds' or PMCs).

The first clouds were detected inside the Arctic Circle by the NOAA 21 satellite. The northern season for NLCs began on May 26th. There are no significant coronal holes on the Earthside of the sun. Switch to: Europe, USA, New Zealand, Antarctica Neutron counts from the University of Oulu's Sodankyla Geophysical Observatory show that cosmic rays reaching Earth are slowly declining-a result of the yin-yang relationship between the solar cycle and cosmic rays. Credit: SDO/HMIĬosmic Rays Solar Cycle 25 is intensifying, and this is reflected in the number of cosmic rays entering Earth's atmosphere. They all have relatively simple, stable magnetic fields. There are many spots on he sun today, but none poses a threat for strong flares.

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