Jump to content

All Activity

This stream auto-updates     

  1. Today
  2. Thanks for the response. I’ve read that Nature paper and some of the comments being posted on academic sites. Sadly, the situation has devolved into in-fighting about global warming and the discussion about minimum has disappeared. I keep up on direct imaging of other stars, and recall reading in the paper about Zeta Re that not only was Doppler imaging used but also interferometry, so they were able to discern that there was increased levels of magnetism where the dark spots were.
  3. Actually, this is not 'dynamic', for our sun, relatively speaking. When the sun is this quiet during solar minimum, it affords us the opportunity to perform 'microscopic evaluation' of flux response to at least try and pin it on a particular type of activity. Generally, when the sun is more active, we would not be able to discern which particular phenomenon is moving the flux around here and there, by just a few points. A few months ago, I could directly see a correlation of radio flux boost corresponding to the advent of a sunspot (in conjunction with its very minor flaring). Another reason I'm paying close attention to the flux down here is to see when 'bottoming-out' for SC24 occurs. Regarding other stars, I'm sure they can vary a great deal, depending upon their age. I thought that article you referenced on the observed dark spots on other stars was pretty interesting. However, it wasn't clear whether the darkened areas they were seeing were sunspots, or possibly coronal holes, since the imaging resolution was pretty poor. --------------------- --------------------- --------------------- The moving around of the solar radio flux by a few points, down here at solar minimum, when there doesn't appear to be any discernible activity behind it, is interesting in itself. Maybe there is an answer (or a scientific paper yet to be written) out there to explain it. But maybe a reason for elevated F10.7cm flux without sunspots is already being discussed, per the Svalgaard paper I referenced recently over in the thread titled, Article published on Nature.com predicts new Maunder Minimum, wherein we read: "There is a minimum field strength in visible spots of about 1500 Gauss(0.15 T), and as that 1500 G threshold is approached, magnetic fields appear at the solar surface which do not seem to form dark sunspots or pores. ...the photospheric flux emergence in such cases may take place in flux tubes with fields too weak, or too small a diameter, to form sunspots..." And, "(the) stable relationship between the 10.7 flux and the sunspot number...has steadily deteriorated in the past decade to the point where the sunspot number for a given flux has decreased by about a third."
  4. Yesterday
  5. So the flux is down to 66 and the sun visually appears somewhat relaxed again. I wonder if other stars are this dynamic.
  6. Thank you! They provide a great service to the public. I hope they can figure it out.
  7. 10” is big so If the filter itself is also 10” than the view will be very bright. Reducing it will help. I haven’t build a solar filter for my Orion 12” Dobson because it was too big and more risk of damaging the filter. I had an old 11cm scope which was good enough for the Sun but still no granules. But from what I’ve read you should have an extra filter on your ocular which further reduces the light to reveal details. Take a look at https://www.astromarket.org/filters/blocking-filters/15_15_36/m,Baader-Planetarium
  8. Good to go. https://twitter.com/CovertGoat/status/1174405818483011584?s=20
  9. Some more interesting oddities in the F10.7cm data, eh? You do twitter, yes? Would you mind asking them if their F10.7cm data has been hacked? https://twitter.com/SpaceWeatherCA
  10. Last week
  11. I just came across some information regarding the potential consequences to the Total Solar Irradiance in an era of lower sunspots. The most shocking thing to me is that this is rarely, if ever, mentioned in the online debates regarding a potential impending Grand Solar Minimum. The statement comes from Leif Svalgaard (probably one of the more recognized contemporary solar physicists) in the article, Solar activity – past, present, future, (J. Space Weather Space Clim. 3 (2013) A24 DOI: 10.1051/swsc/2013046): "the number of visible spots in the next cycle (and perhaps beyond) may fall to values not seen since the Maunder Minimum, but without dramatic changes in the emerging magnetic flux. Without the dark spots, Total Solar Irradiance might even be a bit higher." In the typical discussion on the matter, such as the article Global Warming vs. Solar Cooling: The Showdown Begins in 2020, this contrarian view is not discussed. Any comment on this information, Emilio Petrozzi?
  12. I am using a 10" XT10i Orion Dob. I first made the off axis aperture about 3.5", found the sun pretty bright. I reduced it to about 1.5" only and it's still bright, but not as much as was. Does having this small of an aperture ok for the sole purpose of reducing the brightness of the sun? What about the heat being trapped inside the telescope due to covering the open end? Is that of any concern?
  13. Mercury transit is really great to view through a telescope! I witnessed it one time and a rare Venus transit. The kids at school will sure like it!
  14. Anticipating Mercury transit on Nov.11th. My sister in law teaches 5th grade, and I told her I'd bring my telescope to her class that day to show them. My mother's side is from Belgium:-)
  15. With a normal white light filter of Baader I also never saw any granules of the surface. Most scopes are way too big for the vast amount of light of the Sun, although the filter does filter enough it's still very bright. To really see granules, a H-alpha solar telescope is a better fit. You got H-alpha filters for scopes as well but really expensive or the 'cheaper' Coronado PST telescopes. To see sunspots, it ain't the best time indeed 😉 hopefully the new solar cycle will be here soon to get something worth viewing
  16. Amazing site! I made my first solar filter with the Baader Film and viewed the sun today first time in my life. I realize we are in the middle of sunspot minimum, but can i still expect occasionally to see at least one or two on certain days? I know you can't see a whole lot using just a white light filter for the photosphere. The solar granules...i couldn't see anything but solid white. I used a 3.5" aperture on my 10" dobsonian off axis, but it seemed pretty bright to me. I stopped it down to about 1.5" aperture and it's better. Can you give me some opinions and/or advice. Thanks.. Pat
  17. Thank you very much for your explanation. Interesting. Let´s see what new surprises the Sun will bring to us in the future.
  18. I have not seen the observance of this phenomenon (a string of bright points simultaneously popping off at the solar equator) mentioned before. Consider the following: there is only a short window timeframe (3-4 months?) over an ~11-yr Schwabe Cycle where we would expect the event to even possibly occur; during that short timeframe, there is no guarantee that it will actually occur in any solar minimum period, let alone during every solar minimum period (reducing the odds of seeing one further). high tech imagery to observe this type of phenomenon has only been relatively recently available in the modern space age. So in answer to your questions, I don't know, but it may be a long time (many many years) before it is ever observed again? [Now, watch it happen once a week for the next 3-4 months. 🤣🤣😂]
  19. Thanks for the info. Here is the video: https://youtu.be/BdTTSylIHYQ
  20. Before I think about the deeper implications of what you suggest, I'll convey the simple explanation for which I was inferring. You may have learned by now that the end phase of every Schwabe Cycle is the solar minimum period of approximately 3 yrs in duration. (The Schwabe Cycle is ~11 yrs in duration, being 1/2 of a full 22-year 'magnetic cycle'; the polarity of sunspots reverses each half of the 'magnetic cycle'.) The most commonly accepted solar dynamo theory assumes that the sunspots move to the equator over the duration of the Schwabe cycle; they first start out at about 40 degrees latitude ('bright points' can display at much higher latitudes) in each hemisphere, and by the end of the cycle, they are close to the equator. (There is some overlap between cycles, which is further explained under descriptions of the 'Butterfly Diagram', which I'll leave to the reader to investigate further.) So what we see displayed in this rare solar phenomenon is the magnetic fields of multiple 'bright points' (note, not all 'bright points' have sufficiently strong enough magnetic fields associated with them to pierce the photosphere, creating a sunspot) being displayed simultaneously about as close to the solar equator that they can get. This is a sign that we are relatively close to the bottom of the solar minimum period. Jupiter and Saturn are currently on the same side of the sun, fairly close to each other. They are currently off to the 'left' (towards 'solar east') of earth, which I think is what you refer to as "exact opposite" the 'bright points' being displayed, but nonetheless, "exact opposite" usually infers being completely on the other side of the sun (as in a superior conjunction) . I'd like to review that video, assuming I can find it, or if you have a link. Actually, I'll have to review S. McIntosh's work, but I think he would indicate this is a sign we are close to what he refers to as "Terminator", which typically occurs sometime after the Solar Minimum Nadir.
  21. Can’t get a more serious website because on phone, but do those spots seem to coincide with Jupiter and Saturn being at the exact opposite side of the Sun? Could flux ropes from Jupiter and Saturn “crossing” cause such phenomena? I mention this because I recall seeing a video by NASA of the most recent X class flare sending gamma rays out into space and the Fermi telescope seeing them hit the opposite side of the sun some time later. It was mentioned they traveled along magnetic field lines. While not the same phenomena, perhaps there is a “short circuit” of sorts taking place here between interacting flux roles.
  22. When was the last time that this happend? How often this occurs?
  23. There is a solar minimum phenomenon going on right now, which is likely rare to see. It is a series of 'bright points' simultaneously popping off in a line along the equator (images below).
  24. In addition, if I'm not mistaken, that area of solar disk containing the persistent magnetic structure discussed above for 'Case 2', is also responsible for producing the 'Stealthy CME' in the following thread: Evolution of a "Stealthy CME". Nope, sorry, this last statement is not necessarily true. The 'Stealthy CME' discussed in that thread occurred on 08/13/19, and only the first of the coronal holes straddling the persistent magnetic structure had appeared in the STEREO-A frame by that date, per the image below:
  25. So far in 2019, the GOES-14 has registered the discussed TRIGGER ALERT SIGNAL in the months of May, July and August; graphs for those months are shown below. So far in 2019, GOES-15 has registered the discussed TRIGGER ALERT SIGNAL in the months of May, July and August; graphs for those months are shown below.
  26. I think you meant September rather than October. I suspect it to again be earth facing on 2019.09.23-2019.09.27, with an associated Geomagnetic disturbance date interval of 2019.09.27-2019.10.02. Listed below is pertinent info on its previous four earth-facing visits (data source): STAR Coronal hole tag Location Earth facing position date interval Geomagnetic disturbance date interval Kp dominant / Kp max / ap max Max solar wind speed (km/s) Comment CH935 trans equatorial 2019.08.27-2019.08.31 2019.08.30-2019.09.05 4/6/67 872 ref. CH932 CH932 trans equatorial 2019.08.01-2019.08.02 2019.08.05-2019.08.08 3/5/56 708 ref. CH928 CH928 northern 2019.07.05-2019.07.07 2019.07.09-2019.07.11 3/5/39 623 ref. CH923 CH923 northern 2019.06.09 2019.06.12-2019.06.14 2/4/27 459 The following two images show what that area looked like, from STEREO-A, one week (approximate) before its last earth-facing position, and today: The following threads also had discussion on the persistent magnetic structure and associated coronal hole(s) being discussed above: Multi-Rotation Persistent Magnetic Structure ('Case 2' in that thread). Coronal Hole Polarity & Planetary Magnetic Connection Coronal Hole Occlusion.
  27. The trans-equatorial coronal hole that developed east (to the left) of the persistent magnetic structure discussed for 'Case 2' in this thread was earth facing on 2019.08.27-2019.08.31; its associated Geomagnetic disturbance date interval was 2019.08.30-2019.09.05 and it produced a Max solar wind speed of 872 km/s (reference www.solen.info ). Here are other thread discussions related to this persistent magnetic structure and associated coronal hole(s): Coronal Hole Occlusion Coronal Hole Polarity & Planetary Magnetic Connection.
  28. We just released a big update for our SpaceWeatherLive app on iOS and Android! - You can now select which space weather alerts you want to receive. - Tired of the ads? Remove them with an in-app subscription. With your help we can keep our services online and keep you up to date with the latest space weather events. more information in the news section.
  1. Load more activity
  • Newsletter

    Want to keep up to date with all our latest news and information?
    Sign Up
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you also agree to our Terms of Use and our Privacy Policy.