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Activitatea solara

Coronal Holes: 21 Feb 11

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A solar wind stream flowing from this shallow coronal hole could brush past Earth on Feb. 23rd or 24th. Credit: SDO/AIA.



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[font="Arial, Helvetica, sans-serif"]EASTERN BLAST: [/font]The quiet didn't last long. Earth-orbiting satellites detected an M3-class solar flare at 0735 UT on Feb. 24th. The source was an active region located just behind the sun's eastern limb. The eruption also produced strong radio emissions, a coronal mass ejection (not Earth directed), and this spectacular picture taken by NASA's Solar Dynamics Observatory. Stay tuned for updates.

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Daily Sun: 01 Mar 11

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Growing sunspot 1164 (movie) has a complex "beta-gamma" magnetic field that harbors energy for M-class solar flares. Credit: SDO/HMI



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[font="Arial, Helvetica, sans-serif"]FARSIDE ACTIVITY: [/font]This morning, March 4th, multiple flares erupted behind the sun's eastern limb. NASA's STEREO-B spacecraft detected a shadowy shock wave in the sun's atmosphere while the Solar and Heliospheric Observatory (SOHO) recorded at least two plasma clouds billowing into space. Today's blasts were not Earth-directed, but future blasts could be geoeffective as the active zone turns toward our planet in the days ahead.

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[font="Arial, Helvetica, sans-serif"]HIGH SOLAR ACTIVITY: [/font]Solar Cycle 24 is heating up. No fewer than three sunspots (1164, 1165, and 1166) are crackling with M-class solar flares, and each of them has a delta-class magnetic field capable of producing even more powerful X-flares. Scroll past the space shuttle for information about a CME now heading our way.


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[font="Arial, Helvetica, sans-serif"]INCOMING CME: [/font]The magnetic canopy of sunspot 1166 erupted on March 7th around 1400 UT, producing an M2-class solar flare and a bright coronal mass ejection (CME).


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The CME was not squarely directed at Earth. Nevertheless, the cloud will probably deliver a glancing blow to our planet's magnetic field on March 9th or 10th, possibly sparking polar geomagnetic storms. High-latitude sky watchers should be alert for auroras.


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[font="Arial, Helvetica, sans-serif"]FAST CORONAL MASS EJECTION: [/font]A coronal mass ejection (CME) exploded from the vicinity of sunspot 1164 during the late hours of March 7th. It leapt away from the sun traveling ~2200 km/s, making it the fastest CME since Sept. 2005. A movie of the cloud prepared by Karl Battams of the Naval Research Lab shows a possibly substantial Earth-directed component. This CME and at least one other could brush against Earth's magnetic field on March 9th or 10th. High-latitude sky watchers should be alert for auroras.


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[font="Arial, Helvetica, sans-serif"]Behemoth sunspot 1166 has a "beta-gamma-delta" magnetic field that harbors energy for X-class flares. Credit: SDO/HMI[/font]
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[font="Arial, Helvetica, sans-serif"]X-FLARE: [/font]March 9th ended with a powerful solar flare. Earth-orbiting satellites detected an X1.5-class explosion from behemoth sunspot 1166 around 2323 UT. A movie from NASA's Solar Dynamics Observatory shows a bright flash of UV radiation plus some material being hurled away from the blast site:


Movie formats: 4 MB gif, 1.2 MB iPad, 0.3 MB iPhone​
After four years without any X-flares, the sun has produced two of the powerful blasts in less than one month: Feb. 15th and March 9th. This continues the recent trend of increasing solar activity, and shows that Solar Cycle 24 is heating up. NOAA forecasters estimate a 5% chance of more X-flares during the next 24 hours. Stay tuned.​
 

Prognoza NOAA de furtuna geomagnetica 11.03.2011

Planetary K-index
Now: Kp=[font="Arial, Helvetica, sans-serif"] 5 [/font]storm
24-hr max: Kp= 6 storm
explanation | more data
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Interplanetary Mag. Field
B[sub]total[/sub]: 7.5 nT
B[sub]z[/sub]: 4.3 nT south
explanation | more data
Updated: Today at 0627 UT


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[font="Arial, Helvetica, sans-serif"]PARTING SHOT: [/font]Departing sunspot 1169 erupted during the late hours of March 16th and hurled a spectacular coronal mass ejection (CME) over the sun's western limb.

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Only a week ago, sunspot 1169 was squarely facing our planet. If the eruption had occurred then, we'd be expecting bright auroras and geomagnetic storms before the weekend. Instead, this CME will sail wide right of Earth with negligible effect.

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[font="Arial, Helvetica, sans-serif"]MAGNETIC FILAMENT: [/font]A long and sinuous filament of magnetism is snaking over the sun's western limb. NASA's Solar Dynamics Observatory captured the 200,000 km-long structure in mid-twist on the morning of March 18th:​

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[align=left]Long filaments like this one are often unstable. If this one erupts, it could hurl pieces of itself toward Earth. More likely, the filament will continue to wind over the western limb, active but intact. Either way it's a good show. Readers with solar telescopes are encouraged to monitor developments.​

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[font="Arial, Helvetica, sans-serif"]ICONIC ERUPTION: [/font]A huge filament of magnetism and hot plasma blasted off the sun's southwestern limb on March 19th around 1200 UT. The eruption was not Earth-directed, but it was iconic. Just look at this snapshot recorded by NASA's Solar Dynamics Observatory:


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Many amateur astronomers in Europe witnessed the blast and said it was the biggest one they'd ever seen. This event continues the recent trend of increasing solar activity, and shows anew that Solar Cycle 24 is gaining steam after a long period of relative quiet.


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[font="Arial, Helvetica, sans-serif"]HERE COMES TROUBLE? [/font]A big sunspot is emerging over the sun's southeastern limb, and it is crackling with activity. NASA's Solar Dynamics Observatory recorded a surge of extreme ultraviolet radiation from the sunspot's magnetic canopy on March 21st:


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Detalii


This appears to be the return of old sunspot 1165, last seen in early March when it formed on the sun's southwestern limb. Since then it has been transiting the far side of the sun, apparently growing in size and restlessness. The potential for trouble will become more clear in the hours ahead as the active region emerges in full. Stay tuned.


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GRAND FILAMENT: A magnificent filament of magnetism is curling around the sun's southeastern quadrant today. Measuring more than 700,000 km from end to end, the vast structure is about twice as long as the separation between Earth and the Moon. Arrows trace the filament's meandering path in this extreme UV image from NASA's Solar Dynamics Observatory:


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It's not easy for such a filament to remain suspended indefinitely above the stellar surface, and indeed a collapse is possible. Filaments falling onto the sun can trigger explosions called "Hyder flares." Is one in the offing? Readers with solar telescopes are encouraged to monitor developments.

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Daily Sun: 13 Apr 11


New sunspot 1190 is growing rapidly and could soon pose a threat for Earth-directed flares. Credit: SDO/HMI

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EMERGING SUNSPOTS: More solar activity could be in the offing. As sunspot 1190 grows rapidly near the center of the solar disk, a new and large sunspot is rotating over the sun's eastern limb. A 24-hour movie from the Solar Dynamics Observatory shows how the sunspot number is increasing.
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Coincidenta foarte interesanta. O cometa s-a dezintegrat in apropierea Soarelui in 11 Mai 2011, si s-a produs o CME de proportii.


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NASA anunta o furtuna geomagnetica pentru joi

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O explozie solara de proportii, clasa M-2, generata de o furtuna solara de intensitate medie, a fost inregistrata marti, de observatorul SDO, de la NASA.

Explozia solara, ce a durat 3 ore, va determina o furtuna geomagnetica ce va duce la aparitia mai multor aurore decat in mod normal, conform cercetatorilor de la Goddard Space Flight Center.

Instabilitatile Kelvin-Helmholtz au fost sesizate de catre Observatorul Solar Dynamics - SDO pe 7 iunie, in ultraviolete, fiind vorba de o eruptie de plasma rece, la temperaturi de 80.000 de grade Kelvin, informeaza site-ul oficial al NASA.

Fenomenul a fost vizualizat si de Observatorul Solar terestru - STEREO, dar si catre de observatorul SOHO, scrie Physorg.

Ejectia coronala - fluxul de plasma solara magnetizata - se deplaseaza cu o viteza de 1.400 km/secunda si va lovi Pamantul pe 9 iunie 2011.

Cercetatorii si specialistii in domeniu spera ca pe baza datelor nou colectate vor afla daca, intr-adevar, corona solara este de mii de ori mai fierbinte decat se prevazuse initial.

"Corona este de 1.000 de ori mai fierbinte decat suprafata soarelui vizibil, iar mecanismul de incalzire reprezinta o provocare pentru oamenii de stiinta, tinand cont ca acum detinem dovezi certe ale undelor Kelvin-Helmholtz", a declarat Leon Ofman, cercetator la NASA Goddard Space Flight Center, profesor asociat la Greenbelt, Maryland si Universitatea Catolica din Washington.

In prezent, soarele trece prin perioada de activitate maxima a ciclului sau de aproximativ 11 ani.

Sursa ziare.com
 
Eruptia a fost spectaculoasa, dar atat. Clasa M2 este minora, nici macar nu a fost orientata spre Pamant, pata solara 1228 la momentul eruptiei nici macar nu se mai afla de 3 zile pe partea dinspre Pamant a Soarelui, asa ca despre o CME care ar putea sa atinga Pamantul, nici vorba. In jur de data de 14 iunie, ar putea fi un vant solar care sa produca ceva aurore : http://www.spaceweather.com/
 
Explozie Solara de clasa C7 in data de 21.06.2011 a petei 1236

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Imaginea SOHO arata un "halo" ca rezultat al exploziei (CME) :

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Eruptia nu pare a fi masiva, dar se pare ca va avea totusi un efect asupra campului geomagnetic (Un "rest" de CME ar putea atinge campul magnetic terestru)

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Cel putin doua CME sunt astepate sa atinga Terra in seara zilei de 4 august, ca urmare a eruptiilor din dada de 2 si 3 august, ale petei solare 1261

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Actualizare

Astazi, 4 august, pata solara 1261 a produs inca o explozie catalogata la nivelul M9.3, si o CME cu o viteza estimata de 1950 km/s
Se estimeaza ca acesta va interfera cu cele doua precedente si va atinca Terra in dupaamiaza zilei de maine
 
Ca urmare a frontului combinat al CME (eruptiilor coronariene de masa) din zile de 2-4 august, se inregistreaza o futuna geomagnetica severa, KP=7(puternica), cu perspectiva pentru ziua in curs de KP=8(severa). Primul impact a avut loc in data de 5 august la ora 18 UT. Rapoartele de pana acum indica ca aurorele sunt vizibile inclusiv din Olanda, Germania, Danemarca, Anglia si Scotia, ceaa ce indica ca impactul asupra campului geomagnetic este foarte puternic.

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