Actividade Solar 2017

Tópico em 'Astronomia' iniciado por luismeteo3 2 Abr 2017 às 21:16.

  1. luismeteo3

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  2. luismeteo3

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    ALERT: Geomagnetic K-index of 7
    Threshold Reached: 2017 May 28 0419 UTC
    Active Warning: Yes
    NOAA Scale: G3 - Strong


    NOAA Space Weather Scale descriptions can be found at
    www.swpc.noaa.gov/noaa-scales-explanation

    Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.

    Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.

    Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.

    Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased
    range error may occur.

    Radio - HF (high frequency) radio may be intermittent.

    Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon

    http://solarham.net/planetk.htm
    http://solarham.net/bulletins.htm
     
  3. Toby

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    [​IMG]
     
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    Aristocrata e luismeteo3 gostaram disto.
  4. luismeteo3

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  5. luismeteo3

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  6. luismeteo3

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    Source of this massive plasma cloud looks to be a solar flare from old sunspot region 2665 as you can see on our header image at the top of this page. We do not have a satellite like the GOES-series that monitors far side solar X-ray emissions but using STEREO imagery it looks like this was at least a high M-class solar flare, perhaps an X1 event.


    https://www.spaceweatherlive.com/en/news/view/289/20170723-major-far-side-coronal-mass-ejection

    Coincidentally, today's farside explosion occurred on the 5th anniversary of another significant farside event: The Solar Superstorm of July 23, 2012. That superstorm, which has been compared to the historic Carrington Event of 1859, could have caused widespread power blackouts if it had not missed our planet.

    Sunspot AR2665 will be back on the Earthside of the sun starting little more than a week from now. If the sunspot remains active, it could bring a new round of geomagnetic storms and auroras to our planet in early August. Stay tuned.

    http://www.spaceweather.com/

    colleagues from NASA and other universities, published a seminal study of the storm in the December 2013 issue of the journal Space Weather. Their paper, entitled "A major solar eruptive event in July 2012," describes how a powerful coronal mass ejection (CME) tore through Earth orbit on July 23, 2012. Fortunately Earth wasn't there. Instead, the storm cloud hit the STEREO-A spacecraft.

    "I have come away from our recent studies more convinced than ever that Earth and its inhabitants were incredibly fortunate that the 2012 eruption happened when it did," says Baker. "If the eruption had occurred only one week earlier, Earth would have been in the line of fire.


    https://science.nasa.gov/science-news/science-at-nasa/2014/23jul_superstorm
     
  7. luismeteo3

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  8. luismeteo3

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    SpaceWeatherLive
    25/7 às 9:13 ·
    This is crazy.

    The powerful far side coronal mass ejection that was launched two days ago by old sunspot region 2665 arrived at STEREO Ahead.

    STEREO Ahead was looking at the blast from the side so a glancing blow was to be expected at best. But this wasn't a gentle glancing blow...

    STEREO Ahead got hit hard. Much harder than one would expect from just a glancing blow. There is some crazy data being recorded by the space craft. There are some data dropouts but we can see an impact already yesterday around 18 UTC where the total field strength of the IMF (Bt) already reached an impressive 40nT. From 20 to 23 UTC there is a data dropout but after 23 UTC we see some intense data where the total field strength of the IMF (Bt) lies close to 80nT with a steady southward component (Bz) near -60nT. These intense readings last for multiple hours which is very strange for a glancing blow. Such stable readings are usually associated with the passing of a CME core. The solar wind peaked at about 700 to 900km/s which is not extremely fast but these readings can be unreliable due to a multitude of reasons, like high energy protons contaminating the data but I suspect the readings are accurate. The magnetometer readings are however reliable and very real.

    What would this mean for our little planet? If we would have seen these kind of numbers at Earth we would have easily experienced an extreme G5 geomagnetic storm with aurora easily visible at low latitudes. Crazy!

    Follow it live on www.spaceweatherlive.com

    [​IMG]


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    jorgeanimal gostou disto.
  9. luismeteo3

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  10. luismeteo3

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  11. luismeteo3

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  12. luismeteo3

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    4ESTAÇÕES gostou disto.
  13. camrov8

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    gostava que me tirassem um duvida, li numa noticia que esta ultima emissão pode provocar auroras que podem ser vistas até Washington dc que é a uma latitude bem mais baixa que a nossa. Nos mapas vê-se sempre uma especie de onda que nos estates vai sempre mais a sul que por estes lados
     
    luismeteo3 e 4ESTAÇÕES gostaram disto.
  14. luismeteo3

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    Geomagnetic storm back to G4 level. Kp 8.

    ALERT: Geomagnetic K-index of 8
    Threshold Reached: 2017 Sep 08 1304 UTC
    Synoptic Period: 1200-1500 UTC
    Active Warning: Yes
    NOAA Scale: G4 - Severe
    www.swpc.noaa.gov/noaa-scales-explanation
    Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
    Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
    Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
    Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
    Radio - HF (high frequency) radio propagation sporadic or blacked out.
    Aurora - Aurora may be seen as low as Alabama and northern California.
     
    Aristocrata gostou disto.
  15. luismeteo3

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