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The Solar System is located within a structure called the Local Bubble, a low-density region of the galactic interstellar medium.[3] Within this region is the Local Interstellar Cloud, an area of slightly higher hydrogen density. The Sun is near the edge of the Local Interstellar Cloud. It is thought to have entered the region at some point between 44,000 and 150,000 years ago and is expected to remain within it for another 10,000 to 20,000 years.
The cloud has a temperature of about 7,000 K (6,730 °C; 12,140 °F),[4] about the same temperature as the surface of the Sun. However, its specific heat capacity is very low because it is not very dense, with 0.3 atoms per cubic centimetre (4.9/cu in). This is less dense than the average for the interstellar medium in the Milky Way (0.5/cm3 or 8.2/cu in), though six times denser than the gas in the hot, low-density Local Bubble (0.05/cm3 or 0.82/cu in) which surrounds the local cloud.[3][5]
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Is the Sun going to enter a million-degree galactic cloud of interstellar gas?
A group of scientists are suggesting that the Ribbon of enhanced emissions of Energetic Neutral Atoms(ENA) discovered last year by the NASA Small Explorer satellite IBEX could be explained by a geometric effect coming up because of approach of the Sun to the boundary between the Local Cloud of interstellar gas and another cloud of a very hot gas called the Local Bubble.
If their hypothesis is correct, IBEX is catching matter from a hot neighboring interstellar cloud, which the Sun might enter in a hundred years.
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Is the solar system entering a nearby interstellar cloud?
Vidal-Madjar, A. (CNRS, Laboratoire de Physique Stellaire et Planetaire, Verrieres-le-Buisson, Essonne, France); Laurent, C. (CNRS, Laboratoire de Physique Stellaire et Planetaire, Verrieres-le-Buisson, Essonne, France); Bruston, P. (CNRS, Laboratoire de Physique Stellaire et Planetaire, Verrieres-le-Buisson, Essonne, France); Audouze, J. (Meudon Observatoire, Hauts-de-Seine; Paris XI, Universite, Orsay, Essonne, France)
Abstract
Observations indicating a hydrogen density gradient in the vicinity of the solar system are reviewed, particularly observations of an anisotropy in the far-UV flux around 950 A from the brightest and closest O and B stars as well as a variation in the local D/H ratio along the lines of sight to Alpha Cen and Alpha Aur. Possible mechanisms that may strongly affect the observed D/H ratio on a very small scale are considered, selected radiation pressure is proposed as the most likely mechanism for deuterium separation, and it is shown that this mechanism would be effective only if the density gradient of the nearby interstellar medium has remained stable for at least about 10 million years. This time scale is taken to imply the existence of a nearby (less than 2 pc distant) interstellar cloud. Observational arguments in favor of such a cloud are presented, and implications of the presence of a nearby cloud are discussed, including possible changes in terrestrial climate. It is suggested that the postulated interstellar cloud should encounter the solar system at some unspecified time in the 'near' future and might have a drastic influence on terrestrial climate in the next 10,000 years.
Publication:
Astrophysical Journal, Vol. 223, p. 589-600 (1978)
Pub Date:
July 1978
DOI:
10.1086/156294
Bibcode:
1978ApJ...223..589V
originally posted by: chr0naut
...
skepticalscience.com...
March 20, 2003 - (date of web publication)
Since the late 1970s, the amount of solar radiation the sun emits, during times of quiet sunspot activity, has increased by nearly .05 percent per decade, according to a NASA funded study.
"This trend is important because, if sustained over many decades, it could cause significant climate change," said Richard Willson, a researcher affiliated with NASA's Goddard Institute for Space Studies and Columbia University's Earth Institute, New York. He is the lead author of the study recently published in Geophysical Research Letters.
"Historical records of solar activity indicate that solar radiation has been increasing since the late 19th century. If a trend, comparable to the one found in this study, persisted throughout the 20th century, it would have provided a significant component of the global warming the Intergovernmental Panel on Climate Change reports to have occurred over the past 100 years," he said.
...
...
The Sun is more active now than over the last 8000 years
An international team of scientists has reconstructed the Sun's activity over the last 11 millennia and forecasts decreased activity within a few decades
October 28, 2004
The activity of the Sun over the last 11,400 years, i.e., back to the end of the last ice age on Earth, has now for the first time been reconstructed quantitatively by an international group of researchers led by Sami K. Solanki from the Max Planck Institute for Solar System Research (Katlenburg-Lindau, Germany). The scientists have analyzed the radioactive isotopes in trees that lived thousands of years ago. As the scientists from Germany, Finland, and Switzerland report in the current issue of the science journal "Nature" from October 28, one needs to go back over 8,000 years in order to find a time when the Sun was, on average, as active as in the last 60 years. Based on a statistical study of earlier periods of increased solar activity, the researchers predict that the current level of high solar activity will probably continue only for a few more decades.
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originally posted by: ElectricUniverse
originally posted by: chr0naut
...
skepticalscience.com...
Skeptical science?... The same people who claim that the Sun's activity stopped increasing in the 1980s? Which throughout the years some of us, and myself included have proven in these forums through various scientific articles to be lies? Among the many other lies they post in there as if they were truth?...
Here is a graph showing how the strength and number of magnetic storms on the Sun had continued to increase until we had the pause around 2005-2006 at which time our global temperatures also slowed down because the sun's activity lowered during that time.
The blue data in the graph shows the increase in magnetic storm activity on the Sun had continued to increase despite the lies that the Sun's activity stopped increasing, you take your pick, first it was claimed in the 1950s, and then the 1980s, when these are only lies.
Here is a NASA scientific article debunking the lie from your preferred site "skeptical science" that the Sun's activity stopped increasing in the 1980s...
March 20, 2003 - (date of web publication)
Since the late 1970s, the amount of solar radiation the sun emits, during times of quiet sunspot activity, has increased by nearly .05 percent per decade, according to a NASA funded study.
"This trend is important because, if sustained over many decades, it could cause significant climate change," said Richard Willson, a researcher affiliated with NASA's Goddard Institute for Space Studies and Columbia University's Earth Institute, New York. He is the lead author of the study recently published in Geophysical Research Letters.
"Historical records of solar activity indicate that solar radiation has been increasing since the late 19th century. If a trend, comparable to the one found in this study, persisted throughout the 20th century, it would have provided a significant component of the global warming the Intergovernmental Panel on Climate Change reports to have occurred over the past 100 years," he said.
...
...
NASA STUDY FINDS INCREASING SOLAR TREND THAT CAN CHANGE CLIMATE
That research shows that until at least 2003, the end of the study, this trend had continued to increase.
What's more this article is from 2004.
The Sun is more active now than over the last 8000 years
An international team of scientists has reconstructed the Sun's activity over the last 11 millennia and forecasts decreased activity within a few decades
October 28, 2004
The activity of the Sun over the last 11,400 years, i.e., back to the end of the last ice age on Earth, has now for the first time been reconstructed quantitatively by an international group of researchers led by Sami K. Solanki from the Max Planck Institute for Solar System Research (Katlenburg-Lindau, Germany). The scientists have analyzed the radioactive isotopes in trees that lived thousands of years ago. As the scientists from Germany, Finland, and Switzerland report in the current issue of the science journal "Nature" from October 28, one needs to go back over 8,000 years in order to find a time when the Sun was, on average, as active as in the last 60 years. Based on a statistical study of earlier periods of increased solar activity, the researchers predict that the current level of high solar activity will probably continue only for a few more decades.
...
The Sun is more active now than over the last 8000 years
That site "skeptical science" was founded by a former Australian cartoonist and web developer, John Cook. Whose Phd is in cognitive science, aka cognitive psychology of climate science denial..., which has nothing to do with "Climate change..." Except "imaginary feelings" which hide a need to control people. AKA a control freak.
John Cook has also been found to "cook" a lot of false data. Alongside many other activist scientists that are more interested in activism than on real science and have been found to have lied, hidden scientific facts, changed and deleted raw temperature data, etc... Among many of their crimes against humanity "so they could FEEL better..."
Cook's 97% climate consensus paper crumbles upon examination
originally posted by: chr0naut
Generally, solar activity has been measured in sunspot number since 1755-1756.
Solar activity reached a recent peak of a 332.33 sunspot number in October-December 1957, and peaks have been diminishing since them. Last year's 'peak' in October-December had a sunspot number of only 24.07.
Based upon known science, the next grand solar minimum is estimated to be due somewhere about 2050. The reducing solar activity observed since the late '50's is entirely in line with the proposed aggregate levels of solar activity.
The thing is, there is something chaotic in solar fluctuation. This doesn't mean that is entirely unpredictable, but that that there is a latitude of variation within calculable limits.
The papers you have highlighted are explicable as spurious variations and do not negate the overall movement in solar activity. It is like the difference between local weather events, and global climate. They are two different things and are often confused by climate change deniers.
solar activity
noun Astronomy.
the sum of all variable and short-lived disturbances on the sun, as sunspots, prominences, and solar flares.
The sun is a magnetic variable star that fluctuates on times scales ranging from a fraction of a second to billions of years.
Solar flares, coronal mass ejections, high-speed solar wind, and solar energetic particles are all forms of solar activity. All solar activity is driven by the solar magnetic field.
Credit: NASA
Declining solar activity linked to recent warming
The Sun may have caused as much warming as carbon dioxide over three years.
Quirin Schiermeier
An analysis of satellite data challenges the intuitive idea that decreasing solar activity cools Earth, and vice versa. In fact, solar forcing of Earth's surface climate seems to work the opposite way around — at least during the current Sun cycle.
Joanna Haigh, an atmospheric physicist at Imperial College London, and her colleagues analysed daily measurements of the spectral composition of sunlight made between 2004 and 2007 by NASA's Solar Radiation and Climate Experiment (SORCE) satellite. They found that the amount of visible light reaching Earth increased as the Sun's activity declined — warming the Earth's surface. Their unexpected findings are published today in Nature1.
The study period covers the declining phase of the current solar cycle. Solar activity, which in the current cycle peaked around 2001, reached a pronounced minimum in late 2009 during which no sunspots were observed for an unusually long period.
Sunspots, dark areas of reduced surface temperature on the Sun caused by intense magnetic activity, are the best-known visible manifestation of the 11-year solar cycle. They have been regularly observed and recorded since the dawn of modern astronomy in the seventeenth century. But measurements of the wavelengths of solar radiation have until now been scant.
Radiation leak
Haigh's team compared SORCE's solar spectrum data with wavelengths predicted by a standard empirical model based mainly on sunspot numbers and area, and noticed unexpected differences. The amount of ultraviolet radiation in the spectrum was four to six times smaller than that predicted by the empirical model, but an increase in radiation in the visible wavelength, which warms the Earth's surface, compensated for the decrease.
Contrary to expectations, the net amount of solar energy reaching Earth's troposphere — the lowest part of the atmosphere — seems to have been larger in 2007 than in 2004, despite the decline in solar activity over that period.
The spectral changes seem to have altered the distribution of ozone molecules above the troposphere. In a model simulation, ozone abundance declined below an altitude of 45 kilometres altitude in the period 2004–07, and increased further up in the atmosphere.
The modelled changes are consistent with space-based measurements of ozone during the same period.
"We're seeing — albeit limited to a very short period — a very interesting change in solar irradiation with remarkably similar changes in ozone," says Haigh. "It might be a coincidence, and it does require verification, but our findings could be too important to not publish them now."
Sun surprise
The full implications of the discovery are unclear. Haigh says that the current solar cycle could be different from previous cycles, for unknown reasons. But it is also possible that the effects of solar variability on atmospheric temperatures and ozone are substantially different from what has previously been assumed.
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originally posted by: ElectricUniverse
Not sure if there are any fans to this Amazon series.
originally posted by: ElectricUniverse
originally posted by: chr0naut
Wrong. That "belief" that solar activity is just measured through sunspots is an "old belief." But like always, the real science deniers are not up to date with science...
solar activity
noun Astronomy.
the sum of all variable and short-lived disturbances on the sun, as sunspots, prominences, and solar flares.
www.dictionary.com...
The sun is a magnetic variable star that fluctuates on times scales ranging from a fraction of a second to billions of years.
Solar flares, coronal mass ejections, high-speed solar wind, and solar energetic particles are all forms of solar activity. All solar activity is driven by the solar magnetic field.
Credit: NASA
www.nasa.gov...
The claim that the sun's activity has been reducing since the 1950s, or the 1980s are old lies based on old speculation and ignorance.
Not to mention the fact that a few years back the sun started acting strange. During a time when the Sun's overall activity was declining considerably around 2007, instead of emitting less heat the sun was emitting more heat and more light. Which led the lead scientist to speculate that we could be seeing a new solar cycle different from past ones for "unknown reasons."
Declining solar activity linked to recent warming
The Sun may have caused as much warming as carbon dioxide over three years.
Quirin Schiermeier
An analysis of satellite data challenges the intuitive idea that decreasing solar activity cools Earth, and vice versa. In fact, solar forcing of Earth's surface climate seems to work the opposite way around — at least during the current Sun cycle.
Joanna Haigh, an atmospheric physicist at Imperial College London, and her colleagues analysed daily measurements of the spectral composition of sunlight made between 2004 and 2007 by NASA's Solar Radiation and Climate Experiment (SORCE) satellite. They found that the amount of visible light reaching Earth increased as the Sun's activity declined — warming the Earth's surface. Their unexpected findings are published today in Nature1.
The study period covers the declining phase of the current solar cycle. Solar activity, which in the current cycle peaked around 2001, reached a pronounced minimum in late 2009 during which no sunspots were observed for an unusually long period.
Sunspots, dark areas of reduced surface temperature on the Sun caused by intense magnetic activity, are the best-known visible manifestation of the 11-year solar cycle. They have been regularly observed and recorded since the dawn of modern astronomy in the seventeenth century. But measurements of the wavelengths of solar radiation have until now been scant.
Radiation leak
Haigh's team compared SORCE's solar spectrum data with wavelengths predicted by a standard empirical model based mainly on sunspot numbers and area, and noticed unexpected differences. The amount of ultraviolet radiation in the spectrum was four to six times smaller than that predicted by the empirical model, but an increase in radiation in the visible wavelength, which warms the Earth's surface, compensated for the decrease.
Contrary to expectations, the net amount of solar energy reaching Earth's troposphere — the lowest part of the atmosphere — seems to have been larger in 2007 than in 2004, despite the decline in solar activity over that period.
The spectral changes seem to have altered the distribution of ozone molecules above the troposphere. In a model simulation, ozone abundance declined below an altitude of 45 kilometres altitude in the period 2004–07, and increased further up in the atmosphere.
The modelled changes are consistent with space-based measurements of ozone during the same period.
"We're seeing — albeit limited to a very short period — a very interesting change in solar irradiation with remarkably similar changes in ozone," says Haigh. "It might be a coincidence, and it does require verification, but our findings could be too important to not publish them now."
Sun surprise
The full implications of the discovery are unclear. Haigh says that the current solar cycle could be different from previous cycles, for unknown reasons. But it is also possible that the effects of solar variability on atmospheric temperatures and ozone are substantially different from what has previously been assumed.
...
www.nature.com...