Unspecified geomagnetic activity

[MinYoongi]

3 hours ago, Isatsuki San said:

I'm interested in the wake of cme, I wonder how long it will last

Same, on stereo it has now swung northwards confirming what I said earlier : seems to be an snw type of flux rope and the 2nd half of this should be positive

1 hour ago, MZPL said:

Kp has dropped down to 5, despite the fact that we have Bt 30 and Bz -15.

Because more factors than just the BZ need to be favorable !

[Philalethes]

Will be interesting to see if there's any enhanced activity from this CH due to the CME:

[MinYoongi]

1 hour ago, Philalethes Bythos said:

Will be interesting to see if there's any enhanced activity from this CH due to the CME:

Entirely possible, the geomagnetic environment could still be disturbed

altough the bz swung north now like I expected due to the swn flux rope

[Jesterface23]

A level Bt to a gradual decline. It may have another 12 hours or more to it if there is a chance the Bz can rotate back south.

[Isatsuki San]

7 hours ago, MinYoongi said:

Same, on stereo it has now swung northwards confirming what I said earlier : seems to be an snw type of flux rope and the 2nd half of this should be positive

Because more factors than just the BZ need to be favorable !

 

2 hours ago, Jesterface23 said:

A level Bt to a gradual decline. It may have another 12 hours or more to it if there is a chance the Bz can rotate back south.

Do you two agree, what seems to have calmed down? The magnetic field at 22 and it seems it continues to drop slowly, is that normal?

[MinYoongi]

11 minutes ago, Isatsuki San said:

 

Do you two agree, what seems to have calmed down? The magnetic field at 22 and it seems it continues to drop slowly, is that normal?

Yes I’d say this is normal. We‘re still within the CME but since it’s SWN it’s now northward. Unlikely to go south again from what I understood.

[Isatsuki San]

4 hours ago, MinYoongi said:

Sí, diría que esto es normal. Todavía estamos dentro de la CME , pero dado que es SWN, ahora está hacia el norte. Es poco probable que vaya al sur de nuevo por lo que entendí.

although it seems that now there is an improvement of solar wind 520 km / s

[MinYoongi]

32 minutes ago, Isatsuki San said:

although it seems that now there is an improvement of solar wind 520 km / s

I don’t see what’s irregular about that

[Isatsuki San]

Why is there 680 km of solar wind right now?

I'll be honest at first it seemed strange to me to see what I was observing so I went to see the ace satellite and it says the same thing that there is a wind of 600 kilometers per second https://www.swpc.noaa.gov/products/real-time-solar-wind

[Sam Warfel]

Its could be the equatorial CH HSS, or a filament CME, we were supposed to pass a couple of those. 

[Isatsuki San]

Hace 39 minutos, Sam Warfel dijo:

Podría ser el CH HSS ecuatorial , o un CME de filamento , se suponía que íbamos a pasar un par de ellos. 

looking at the satellite ace , it seems that there was a weak impact at 19:15 utc, from 9 bt and bz -7, and I say that time because the wind started there, it is 600 kilometers per second, although there is a problem, there is no deity almost, would it be the CH HHS or just the Cme?

 

 

Edited April 27, 2023 by Isatsuki San
bugged translation

[Jesterface23]

The EPAM made another drop around 19:00Z so that may have been a CIR exit and HSS entry for the central disk CH facing us back on the 24th. We've been in a weaker central disk CH HSS since the CME has passed.

[Isatsuki San]

8 minutes ago, Jesterface23 said:

El EPAM hizo otra caída alrededor de las 19:00Z, por lo que pudo haber sido una salida CIR y una entrada HSS para el disco central CH frente a nosotros el día 24. Hemos estado en un disco central CH HSS más débil desde que pasó el CME .

question, so is the ch-hh then why is there very little desinity?

[Jesterface23]

8 minutes ago, Isatsuki San said:

question, so is the ch-hh then why is there very little desinity?

With CHs back to back, there may not be a strong CIR. SOHO did have a slight rise in density,

[Philalethes]

5 hours ago, Isatsuki San said:

question, so is the ch-hh then why is there very little desinity?

As per my understanding, the fast Solar wind itself is less dense than the "regular" slow Solar wind, so if something else clears the way in advance there won't be as much compression of the slow wind (the CIR) when the fast wind comes through, and the result is more persistent low-density wind. Jesterface23 points out above that the previous CH could have contributed to clearing the path in this manner, and I would guess the CMEs could also have contributed to this, although it's unclear just how long that effect persists after they pass.

[Isatsuki San]

56 minutes ago, Philalethes Bythos said:

Según tengo entendido, el viento solar rápido en sí mismo es menos denso que el viento solar lento "regular", por lo que si algo más despeja el camino por adelantado, no habrá tanta compresión del viento lento (el CIR) cuando el viento rápido pasa el viento y el resultado es un viento de baja densidad más persistente. Jesterface23 señala anteriormente que el CH anterior podría haber contribuido a despejar el camino de esta manera, y supongo que las CME también podrían haber contribuido a esto, aunque no está claro cuánto tiempo persiste ese efecto después de que pasan.

then there is no density on the clear path?

[Philalethes]

7 minutes ago, Isatsuki San said:

then there is no density on the clear path?

Well, there will obviously always be some, but it will be significantly less dense; especially immediately after a fast CME. The interaction dynamics can be quite complex, so it's not always so simple to predict the exact speeds and densities to expect at various points.

[Isatsuki San]

16 minutes ago, Philalethes Bythos said:

Bueno, obviamente siempre habrá alguno, pero será significativamente menos denso; especialmente inmediatamente después de un CME rápido . La dinámica de interacción puede ser bastante compleja, por lo que no siempre es tan simple predecir las velocidades y densidades exactas que se esperan en varios puntos. ex, por lo que no siempre es tan simple predecir las velocidades y densidades exactas que se esperan en varios puntos.

likewise, the filament that had been launched before it does not seem as dense as the previous one, also it not only came alone, it also brought the solar protons along with it

Edited April 27, 2023 by Isatsuki San

[Philalethes]

24 minutes ago, Isatsuki San said:

So that means that the density does not come from cme sometimes, and it only picks it up through the path of the solar wind?

I'm not sure exactly what you're asking. If you mean that the density sometimes increases without any CME occurring then yes, that's what happens when the HSS (high-speed stream, the fast Solar wind) from a CH hits the slow Solar wind in front of it and compresses it, at what's known as the stream interface; this interface will typically have a higher density than both the slow and fast Solar winds, and when there is one or more stable CHs that lead to a regular pattern of this occurring each respective such interface is called a corotating interaction region (CIR). For example, as we can read here:

Quote

Corotating interaction regions (CIRs) are structures formed when high-speed solar wind streams overtake slow solar wind streams as they propagate outward. These structures produce regions of enhanced density and magnetic field strength in the solar wind near the ecliptic plane.

[...]

During this phase, as the Sun rotates, fast wind follows slow wind, and as the streams propagate away from the Sun, the fast wind catches up with the slow wind, compressing the plasma at the boundary, increasing the density in the slow solar wind region. In the fast solar wind the kinetic energy of the plasma is converted into thermal energy, resulting in plasma heating and density decreasing (rarefaction). This contact between the slow and fast solar wind is called the stream interface (SI). If the configuration of the solar corona is stable, the pattern of interaction regions is repeated each time the Sun rotates, and they are called corotating interaction regions (CIRs).

 

Edited April 27, 2023 by Philalethes Bythos
clarity

[Jesterface23]

5 hours ago, Isatsuki San said:

likewise, the filament that had been launched before it does not seem as dense as the previous one, also it not only came alone, it also brought the solar protons along with it

The EPAMp was residual after the first CME passed, held in the CH HSS. It dropped once the CIR had passed. We might have expected a little bit of a spike at arrival if there was a CME.

[Isatsuki San]

On 27/4/2023 at 10:26, Jesterface23 said:

El EPAMp fue residual después de que pasó el primer CME , sostenido en el CH HSS . Cayó una vez que pasó el CIR . Podríamos haber esperado un pequeño aumento a la llegada si hubiera un CME .

wind was for a moment at 700 kilometers per second, now yes, what is happening?

[nancy64]

On 4/27/2023 at 1:43 PM, Philalethes said:

I'm not sure exactly what you're asking. If you mean that the density sometimes increases without any CME occurring then yes, that's what happens when the HSS (high-speed stream, the fast Solar wind) from a CH hits the slow Solar wind in front of it and compresses it, at what's known as the stream interface; this interface will typically have a higher density than both the slow and fast Solar winds, and when there is one or more stable CHs that lead to a regular pattern of this occurring each respective such interface is called a corotating interaction region (CIR). For example, as we can read here:

 

Geomagnetic activities are changes that occur when the magnetic field of the Earth changes due to solar wind or other external factors. It is possible that charged particles from the sun can cause changes in the Earth's magnetic fields. These fluctuations can affect the strength and direction of the field. It is possible to measure geomagnetic activity by using many different indices, such as the K-index, which measures the way that Earth's magnetic field changes. Activating the earth's magnetic field too strongly can cause a large number of problems, such as power outages and problems with radio communications. When there is a strong geomagnetic signal, it is possible to predict and plan for weather events that could impact technology and infrastructure on Earth.

[Isatsuki San]

On 27/4/2023 at 10:26, Jesterface23 said:

El EPAMp fue residual después de que pasó el primer CME , sostenido en el CH HSS . Cayó una vez que pasó el CIR . Podríamos haber esperado un pequeño aumento a la llegada si hubiera un CME .

The solar wind has been at 600 kilometers per second for 3 days and now it has risen a bit to almost 700 kilometers per second, is it really the coronal hole or what is it?

[Jesterface23]

6 minutes ago, Isatsuki San said:

The solar wind has been at 600 kilometers per second for 3 days and now it has risen a bit to almost 700 kilometers per second, is it really the coronal hole or what is it?

It's all still the CH HSS. The HSS has faced us for about 2 days. The velocities should start declining over the next few days.

Edited April 28, 2023 by Jesterface23

[Isatsuki San]

6 minutes ago, Jesterface23 said:

Todo sigue siendo el CH HSS . El HSS nos ha enfrentado durante unos 2 días. Las velocidades deberían comenzar a disminuir en los próximos días.

ok I'll keep an eye on that