Halo CME

@halocme

Solar physicist (alum UTkyAst). I believe solar polar magnetic field must be measured properly before predictions of space weather and solar cycle make sense.

Palo Alto, California
Vrijeme pridruživanja: listopad 2013.

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  1. Prikvačeni tweet
    10. ruj 2017.

    X8.2 flare from was impressive. Coronal wave went past both poles. Big proton event, likely GLE. EIS must've seen plasmoid ejection

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  2. prije 13 sati

    The silhouette indicates this is a presentation by Prof. Banerjee. I would have loved to hear his talk had my travel to India not been scrapped. Incidentally, Lindemann was "a brilliant but arrogant intellectual, who quarrelled sharply with many respected advisers." (Wikipedia)

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  3. 26. sij

    Fantastic news. I bookmarked this extremely informative website. Thank you.

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  4. 26. sij

    Great opportunity to test models of how solar magnetic field extends into the heliosphere. This may impact our understanding of disturbances observed in near-Earth space (or 1AU) and beyond.

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  5. proslijedio/la je Tweet
    23. sij

    Reindeer, gorgeous aurora and happy guests for the past two nights at the aurora borealis observatory on Senja, Norway 😍🦌

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  6. 21. sij

    A nice eruption again today from the new (solar cycle 25) region that has not been promoted to a numbered active region. Clear dimming (and a bit of a large scale coronal wave), but I doubt the eruption will have impact on us. Another example of dimming not signaling a CME?

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  7. 20. sij

    NOAA SWPC forecast discussion issued at 2020 Jan 20 1230 UTC mentions this event. It refers to a B1 flare, but this comes from GOES 15 measurement, which is mostly background. GOES 16 shows A3.3. But GOES 16 data are not available on the X-ray flux page. Please fix this.

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  8. 20. sij

    The recently-emerged solar cycle 25 region produced an impulsive eruption seen as a global coronal wave. The region is almost in Earth-strike zone, but I doubt this event will reach us. Incidentally, the region has apparently failed to be a numbered active region.

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  9. 19. sij

    New region with solar cycle 25 polarity at N18. Let's hope this will get promoted to AR 12757. In the meantime, it produced an eruption with a spectacular large-scale coronal propagating front, which I am looking at now.

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  10. 19. sij

    There was a possibly Earth-directed CME on Jan 14, but it probably won't affect us. The animation compares running ( I(t_(i+1))-I(t_(i)) ) and base (pre-event subtracted, I(t)-I(0) ) difference techniques. The latter is good for long-last changes, such as dimming.

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  11. 14. sij

    Live from . NASA’s is giving another inspiring talk that reminds us how wonderful it is to be a scientist.

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  12. 14. sij

    X-ray flux data at . Diurnal variations are clearly seen. Flux in long wavelength (1-8 A, red) is at valley around 18 UT everyday. Short channel (blue) shows double peaks. How can these represent true X-ray flux? One needs to be careful at low flux.

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  13. 13. sij

    28th anniversary of the “Masuda (増田)” flare observed by Yohkoh (陽光).

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  14. 11. sij

    The CME that occurred on Jan 7 was a beautiful flux-rope CME (left: intensity, right: running difference, the movie credit to Kevin Schenk). No clear signatures in AIA EUV images, that is, stealthy. Or a far-side CME? We have no clue as to activity behind west limb (no STEREO-B).

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  15. 9. sij

    The region that emerged yesterday was a new (solar cycle 25) polarity region at latitude N22. It should be AR 12756.

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  16. 8. sij

    Yes, I slowly understand the red and blues lines in represent data from GOES-16, which is more sensitive and accurate at low flux conditions. But are slow variations due to X-rays, unaffected by killer electrons?

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  17. 8. sij

    Continued and calibrated measurement of the solar X-ray flux is very important for our everyday life. But the plot at does not make sense to me. Do red and blue really represent fluxes from GOES-16? We've seen this for a month.

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  18. 5. sij

    If you look at solar images closely, you may find something unexpected. There was a large-scale coronal wave, not associated with a flare (and likely not with a CME) from a region that was not registered as an active region. A second eruption to NW may or may not be related.

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  19. proslijedio/la je Tweet
    4. sij

    Math for — Open Doors to and Artificial Intelligence — get PDF eBook on The and Foundations of : 👉👈 ———— ——— ➕See the book here:

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  20. proslijedio/la je Tweet
    4. sij

    Download Two Free eBooks (PDF): 1) An Introduction to Statistical Learning, with Applications in R 2) The Elements of Statistical Learning 👉 —————

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  21. 4. sij

    Wow! A great resource for somebody as ignorant and lazy as me. Thank you for posting.

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