ISRO Captures the Signatures of the Recent Solar Eruptive Events from Earth, Sun-Earth L1 Point, and the Moon, on May 14, 2024.
| Photo Credit: ANI

The Indian Space Research Organisation (ISRO) has captured the signatures of the recent solar eruptive events from Earth, Sun-Earth L1 Point, and the Moon.

A powerful solar storm impacted Earth earlier this month, triggered by the highly active region AR13664. This region unleashed a series of X-class flares and coronal mass ejections (CMEs) directed at Earth.

“This is the biggest Geomagnetic storm since 2003 in terms of its strength, as the flaring region on the Sun was as big as the historically important Carrington event that took place in 1859. Multiple X-class flares and CMEs have hit the Earth in the past few days. This had severe effects over high latitudes where trans-polar flights are already being reported to get diverted. More events are expected in the next few days,” ISRO said.

However the space agency said that the Indian sector got less affected as the main hit of the storm happened in the early morning of May 11, when the ionosphere was not developed fully.

“Also, being at lower latitudes, widespread outages haven’t been reported in India,” ISRO said.

Observations from Ground

ISRO said that the Global navigation satellite system network observations at the National Atmospheric Research Laboratory at Gadanki, Andhra Pradesh show decrease of the Total Electron Content (TEC) by more than 50% from May 10 midnight to May 11 morning.

“On 11 May daytime TEC was high by about 10% with large variations indicating disturbed ionosphere. In the evening TEC is nearly 30% more. No L band scintillation has been observed. Radar observations showed no bubble, consistent with TEC and scintillation observed by GNSS receivers,” ISRO said.

It added that the observations by the Thumba node of the Indian Network for Space Weather Impact Monitoring network was more dramatic.

“This is expected, as the ionospheric ring current, which is enhanced during geomagnetic storms, passes over the sky of Thumba,” ISRO said.

Observations from Space

ISRO said that it had mobilised all its observation platforms and systems to record the signatures of this event and that both Aditya-L1 and Chandrayaan-2 have made observations and signatures have been analysed.

It said that the ASPEX payload on-board Aditya -L1 is showing high speed solar wind, high temperature solar wind plasma and energetic ion flux till now.

“The X-ray payloads on-board Aditya-L1 (SoLEXS and HEL1OS) have observed the multiple X- and M-class flares from these regions during the last few days while the in-situ magnetometer (MAG) payload has also observed the events as it passed by the L1 point,” ISRO said

While the Aditya-L1 observes the Sun from the first Sun-Earth Lagrange point, the Chandrayaan-2 orbiter has also captured the signatures of these solar eruptive events from the lunar polar orbit. XSM has observed many interesting phenomena associated with this geomagnetic storm.

Indian spacecraft health

ISRO said that its Master Control Facility team was on alert and watchful of any Geomagnetic activity experienced by geo spacecrafts.

“Momentum Wheel speed deviations were observed along with MTC current saturation in few spacecraft. Spacecraft with one-sided panels had predominant signature variations which required frequent momentum dumping. Otherwise, overall operations were normal. No single event upsets were seen. Star Sensor (SS-2) in INSAT-3DS and Star Sensor (SS-3) in INSAT-3DR were turned off as per mission. Other than this there has not been any major upsets or anomaly observed in any of the 30 GEO spacecrafts so far,” ISRO said.

It added that none of the Earth Observation Satellites of ISRO which were visible from ISRO’s ground stations had any upsets or latch-ups.

Besides, the ISRO Navigation Centre has not noticed any significant degradation in the NaVIC service metrics till now, indicating no or negligible impact from the geomagnetic storm.

Rare stable auroral red arc event in Ladakh due to solar storms, creating spectacular northern lights in high latitudes

In Ladakh, astronomers at the Hanle Dark Sky Reserve saw a red glow on the northwest horizon in the sky from about 1 am on May 11 that continued till early dawn.

“We were fortunate to witness Aurora activities on our all-sky camera during regular telescope observations,” Stanzin Norla, an engineer at the Hanle Dark Sky Reserve, told PTI.

He said a faint red glow was visible to the naked eye along the horizon and the event was captured in much detail by a DSLR camera installed at the Hanle Dark Sky Reserve.

“It streaked through the sky from about 1 am till 3:30 am,” Stanzin said, adding that the skies turned red along the horizon and to a pinkish hue later.

Dorje Angchuk, an engineer at the Indian Astronomical Observatory in Hanle, described the event as a stable auroral red arc, which was a rare occurrence over the skies at Ladakh.

“Auroras seen near the north or south poles are dynamic events. They keep changing. But the one witnessed at Ladakh was more stable. It is called the stable auroral red arc. The steady glow remained in the sky for a couple of hours”, Angchuk said.

Such events are rare at Hanle because it is located far south, Dibyendu Nandi, Head, CESSI at the Indian Institute of Science Education and Research Kolkata, told PTI.

He said the chances of such events being witnessed at places such as Hanle become higher during intense disturbances triggered by solar storms.

“These auroral red arcs are likely caused by heating of the atmosphere by electric currents that are circulating between Earth and outer space,” Mr. Nandi said.

“These ring currents get enhanced during geomagnetic disturbances induced by solar storms and thus the likelihood of observing the red auroral arcs is higher at times when we are in the midst of a severe geomagnetic storm”, he said.

The CESSI said the sun produced strong solar flares beginning on May 8, resulting in five outbursts of plasma capable of disrupting satellites in orbit and power grids here on Earth.

“We are witnessing severe Space Weather at levels we have not seen in the last two decades. It might get worse as more solar storms are expected to impact Earth or maybe just more spectacular auroras for all,” Mr. Nandi said.

The U.S.’ National Oceanic and Atmospheric Administration (NOAA) is calling this an unusual event, pointing out that the flares seem to be associated with a sunspot that’s 16 times the diameter of Earth. An extreme geomagnetic storm in 2003 took out power in Sweden and damaged power transformers in South Africa.

Rare severe solar storm could produce northern lights in the U.S., disrupt power and communications this weekend

NOAA alerted operators of power plants and spacecraft in orbit to take precautions, as well as the Federal Emergency Management Agency.

“For most people here on planet Earth, they won’t have to do anything,” said Rob Steenburgh, a scientist with NOAA’s Space Weather Prediction Center.

The storm could produce northern lights as far south in the U.S. as Alabama and Northern California, according to NOAA. But it was hard to predict and experts stressed it would not be the dramatic curtains of color normally associated with the northern lights, but more like splashes of greenish hues.

“That’s really the gift from space weather — the aurora,” said Mr. Steenburgh. He and his colleagues said the best aurora views may come from phone cameras, which are better at capturing light than the naked eye.

Snap a picture of the sky and “there might be actually a nice little treat there for you,” said Mike Bettwy, operations chief for the prediction center.

Also Watch: What causes the northern lights?

The most intense solar storm in recorded history, in 1859, prompted auroras in central America and possibly even Hawaii. “We are not anticipating that” but it could come close, said NOAA space weather forecaster Shawn Dahl.

This storm poses a risk for high-voltage transmission lines for power grids, not the electrical lines ordinarily found in people’s homes, Mr. Dahl told reporters. Satellites also could be affected, which in turn could disrupt navigation and communication services here on Earth.

An extreme geomagnetic storm in 2003, for example, took out power in Sweden and damaged power transformers in South Africa.

Even when the storm is over, signals between GPS satellites and ground receivers could be scrambled or lost, according to NOAA. But there are so many navigation satellites that any outages should not last long, Mr. Steenburgh noted.

The sun has produced strong solar flares since May 8, resulting in at least seven outbursts of plasma. Each eruption — known as a coronal mass ejection — can contain billions of tons of plasma and magnetic field from the sun’s outer atmosphere, or corona.

The flares seem to be associated with a sunspot that’s 16 times the diameter of Earth, according to NOAA. It’s all part of the solar activity that’s ramping up as the sun approaches the peak of its 11-year cycle.

NASA said the storm posed no serious threat to the seven astronauts aboard the International Space Station. The biggest concern is the increased radiation levels, and the crew could move to a better shielded part of the station if necessary, according to Mr. Steenburgh.

Increased radiation also could threaten some of NASA’s science satellites. Extremely sensitive instruments will be turned off, if necessary, to avoid damage, said Antti Pulkkinen, director of the space agency’s heliophysics science division.

Several sun-focused spacecraft are monitoring all the action.

“This is exactly the kinds of things we want to observe,” Mr. Pulkkinen said.

Washington:

The most powerful solar storm in more than two decades struck Earth on Friday, triggering spectacular celestial light shows in skies from Tasmania to Britain — and threatening possible disruptions to satellites and power grids as it persists into the weekend.

The first of several coronal mass ejections (CMEs) — expulsions of plasma and magnetic fields from the Sun — came just after 1600 GMT, according to the National Oceanic and Atmospheric Administration (NOAA)’s Space Weather Prediction Center.

It was later upgraded to an “extreme” geomagnetic storm — the first since the so-called “Halloween Storms” of October 2003 caused blackouts in Sweden and damaged power infrastructure in South Africa. More CMEs are expected to pummel the planet in the coming days.

Social media lit up with people posting pictures of auroras from northern Europe and Australasia.

“We’ve just woken the kids to go watch the Northern Lights in the back garden! Clearly visible with the naked eye,” Iain Mansfield, a think tanker in Hertford, Britain told AFP.

“Absolutely biblical skies in Tasmania at 4am this morning. I’m leaving today and knew I could not pass up this opportunity,” photographer Sean O’ Riordan posted on X alongside a photo.

Authorities notified satellite operators, airlines and the power grid to take precautionary steps for potential disruptions caused by changes to Earth’s magnetic field.

Unlike solar flares, which travel at the speed of light and reach Earth in around eight minutes, CMEs travel at a more sedate pace, with officials putting the current average at 800 kilometers (500 miles) per second.

They emanated from a massive sunspot cluster that is 17 times wider than our planet. The Sun is approaching the peak of an 11-year cycle that brings heightened activity.

– ‘Go outside tonight and look’ –

Mathew Owens, a professor of space physics at the University of Reading, told AFP that while the effects would be largely felt over the planet’s northern and southern latitudes, how far they would extend would depend on the storm’s final strength.

“Go outside tonight and look would be my advice because if you see the aurora, it’s quite a spectacular thing,” he added. If people have eclipse glasses, they can also look for the sunspot cluster during the day.

In the United States, this could include places such as Northern California and Alabama, officials said.

NOAA’s Brent Gordon encouraged the public to try to capture the night sky with phone cameras even if they can’t see auroras with their naked eyes.

“Just go out your back door and take a picture with the newer cell phones and you’d be amazed at what you see in that picture versus what you see with your eyes.”

– Spacecraft and pigeons –

Fluctuating magnetic fields associated with geomagnetic storms induce currents in long wires, including power lines, which can potentially lead to blackouts. Long pipelines can also become electrified, leading to engineering problems.

Spacecraft are also at risk from high doses of radiation, though the atmosphere prevents this from reaching Earth.

NASA has a dedicated team looking into astronaut safety, and can ask astronauts on the International Space Station to move to places within the outpost that are better shielded.

Pigeons and other species that have internal biological compasses could also be affected. Pigeon handlers have noted a reduction in birds coming home during geomagnetic storms, according to NASA’s Jet Propulsion Laboratory.

Officials said people should have the normal backup plans in place for power outages, such as having flashlights, batteries and radios at hand.

The most powerful geomagnetic storm in recorded history, known as the Carrington Event, occurred in September 1859, named after British astronomer Richard Carrington.

Excess currents on telegraph lines at that time caused electrical shocks to technicians and even set some telegraph equipment ablaze.

(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)