Dibyendu Nandi Profile picture
Sep 15, 2020 11 tweets 8 min read Read on X
Interesting outcome of the voting for the strength of #solarcycle25...people think it's going to be a moderate, NOT weak cycle! What is the solar cycle prediction panel consensus? 1/n Image
What does our own @cessi_iiserkol solar cycle prediction indicate? How about forecasts by diverse groups from around the world employing diverse techniques? Is there consensus on how the Sun's activity would play out over next decade? 2/n
Meanwhile the @NASASun @NOAA solar cycle prediction panel has released its consensus statement. They expect a weak solar cycle 25, which matches with what we predicted based on our solar magnetic field evolution simulations back in 2018. So I agree! 3/n
nasa.gov/press-release/…
Live on @NASA TV now... discussions on why it is important to have advance knowledge of the Sun's activity . To anticipate and mitigate adverse #spaceweather effects on space reliant technologies 4/n
pscp.tv/w/ci-5HnR3LTkw…
First reminder of our #solarcycle25 prediction based on magnetic flux transport and dynamo simulations from back in December 2018 published in @NatureComms (has 18K accesses!). We predicted a weak cycle 25 similar or slightly stronger to cycle 24.
5/n nature.com/articles/s4146…
Second here is our @AAS_ResNotes from 2020 February where we convincingly demonstrated cycle 25 had started by then (more than 2000 downloads 🙂). 6/n
doi.org/10.3847/2515-5… Image
The @NASASun @NOAA solar cycle prediction panel today vindicate our published forecasts on upcoming solar activity and space environmental conditions. Needless to say at @cessi_iiserkol we are mighty thrilled! 7/n
Our research involved data analytics and computational models developed in India by graduate and undergraduate students at @cessi_iiserkol @iiserkol. We are proud of these efforts @asipoec @IUCAAScipop @PrinSciAdvGoI @fiddlingstars @gcanupama @somakrc @TarunSouradeep 8/n
There has been sustained effort over the past decade by few scientists from around the world in deciphering the underlying physics of the predictability of the Sun's activity. A very difficult field. Here is my review of the current state of affairs. 9/n
arxiv.org/abs/2009.01908 Image
What gives me immense satisfaction is the part I and many of my students @cessi_iiserkol have played in illuminating the inner workings of the #Sun. The Sun is our window to the plasma Universe, and to other worlds around distant stars, that adorn the darkness of the night.
10/n Image
Taking a break from Shakespeare and Tagore, ॐ भास्कराय नमः to the one who illuminates the cosmos and our own self. n/n

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More from @ydnad0

Jul 7, 2023
India readies for #Chandrayaan3 launch next week. The primary goal is to test our technical capability of landing a rover on the Moon 🌒 The mission costs about $ 82 million and is @isro s second attempt at a successful moon landing. What most people don't know is that...
+

#Chandrayaan1 and #Chandrayaan2 have made some cool scientific discoveries about the moon, including mapping its surface. While #Chandrayaan3 is not a science centric mission, its success would enable lunar science and exploration. The moon remains a hot target for humanity.
Here's some cool graphics and news from @WIONews
wionews.com/web-stories/in…
Read 5 tweets
Jan 18, 2023
Today I did something I have never done. I declined a grant. The reduced approval was inadequate to support the human resource and computational power necessary to sustain proposed research. Computational modelers in India suffer because agencies devalue local computing needs +
Supporting globally competitive & transformative modelling efforts from India require establishing local computational facilities. While much more expensive local experimental equipment is funded, computational needs continue to be undervalued = major reason India is held back +
More often than not we buy those expensive experimental equipment from abroad, equipment which has already catalyzed pioneering works from other shores; we become followers of that trend. Computational clusters are not unique in that sense but can sustain super creative work +
Read 5 tweets
Jan 17, 2023
This is misleading @xkcd. During solar maximum (when there are more spots on the surface) the total radiation output of the Sun actually increases, implying it is brighter (in common parlance). Because within weeks sunspots break apart giving rise to smaller brighter structures.
These bright structures associated with sunspots are known as faculae (or plage). They end up compensating for the dark spots and increasing the total solar radiation when averaged over weeks to monthly timescale. Here is an ☀️ observational image as evidence.
So bottomline is this was a good joke which people seem to have fallen for given the responses to this comic strip.
Read 4 tweets
May 2, 2022
Anatomy of a near disaster. What happened to @flyspicejet Flight 945 which resulted in severe passenger injuries and damage to the aircraft? I am a #SpaceWeather guy but here's a thread of my analysis on weather closer to home for @DGCAIndia + @JM_Scindia
hindustantimes.com/india-news/dgc…
Flight 945 took off from Mumbai around 5.00 pm en route to the Kazi Nazrul Islam Airport just North-West of steel city Durgapur (see gmaps 👇🏾). Whilst landing around 7.30 pm it was hit by what is being reported as extreme turbulence. Autopilot disengaged, all hell broke lose.
Below are flight tracker map of the Mumbai Durgapur air route taken by Flight 945 + thunderstorm archival data from the weather and radar app roughly corresponding to the time of landing of the aircraft. It flew straight into an intense localised storm, the famous Nor'wester!
Read 14 tweets
May 2, 2022
Trying to upload documents and submit a Core grant to @IndiaDST @serbonline for an hour or so now. The site is barely crawling, not retaining profile information and biodata info, and simply is unworkable now. Deadline 5 pm. What do we do? @Sandeep_1966
This is what is going on!
Switched from chrome to Microsoft edge. No luck here. The main web portal itself is not loading. And am on same network as this mobile, so network here is not an issue.
Read 6 tweets
Jan 12, 2022
Government brings in regulation allowing students to pursue up to 50% courses from institutions other than the one they are enrolled in. Comments in this @ttindia report severely criticize this move. This criticism is 1D and biased in my opinion. Thread +
telegraphindia.com/india/iits-iim…
I do not believe the Government is forcing any institution or student to take online courses from other institutions. They are just making this option available which can be taken advantage of by academic organizations and students in certain circumstances +
This will allow IISERs and other organization's to share courses, balance the disproportionate work load of faculty in teaching intensive institutions (especially Universities) allowing them to spend more time in research and development activities +
Read 7 tweets

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