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Dibyendu Nandi Profile picture
Dibyendu Nandi
@ydnad0
physicist & night blind astronomer; creator of https://t.co/oo7SocydeN; space weather; sehnsucht; what is essential is invisible to the eye - Saint-Exupéry
Jul 7, 2023 • 5 tweets • 2 min read
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...
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#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.
Jan 18, 2023 • 5 tweets • 1 min read
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 +
Jan 17, 2023 • 4 tweets • 2 min read
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.
May 2, 2022 • 14 tweets • 10 min read
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.
May 2, 2022 • 6 tweets • 4 min read
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!
Jan 12, 2022 • 7 tweets • 5 min read
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 +
Jun 1, 2021 • 9 tweets • 7 min read
Has the #WestBengal #COVID19 (partial) lockdown been useful? YES!!! Future prognosis? A thread based on analysis by @cessi_iiserkol team 👇🏾
New daily cases have halved since May 15 (beginning of lockdown).
Left @covid19indiaorg data; Right: CESSI model projection versus data 1/n The pandemic growth rate has dipped below zero during the lockdown and is in the negative which is desirable. The more negative is the growth rate, the faster is the fall in active cases. Negative growth rate needs to be sustained. 2/n
May 30, 2021 • 24 tweets • 17 min read
While it's great to see the debate over solar cycle predictions and #SunspotCycle25 feature in the @nytimes it is unfortunate that the story leaves an impression of a lack of consensus/physics-based understanding. Thread 👇🏾1/n
@NYTScience #SpaceWeather #SunspotCycle25 First, the story by @overbye nicely connects understanding Sun's magnetism with exploration of other active stars and #exoplanets, wherein stellar activity influences conditions suitable for hosting life. It describes well how solar storms create #spaceweather impacting us 2/n Image
Sep 15, 2020 • 11 tweets • 8 min read
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
Aug 30, 2020 • 14 tweets • 13 min read
#coronavirus: As India eases restrictions on activities this is the time to reiterate that WEARING MASKS NOW IS MORE IMPORTANT THAN EVER. More important than when #lockdown was first imposed on 25 March. Because number of active infected persons (dashed line below) is highest. 1/ As long as active infected persons persist in population - and herd immunity or vaccine induced immunity has not been achieved - chances of spreading pandemic is proportional to number of active infected persons, if containment is inadequate. WEARING MASKS PREVENTS SPREAD. 2/
May 12, 2019 • 16 tweets • 4 min read
Glad @PrinSciAdvGoI alluded to the importance of large-scale (computational and mathematical) modeling projects; traditionally India has lagged in these aspects. Computational modeling complements theory, experiments and observations, and illuminates complex systems in nature. Climate, weather and space sciences, disease outbreaks, ecological sciences, traffic and water management, design of novel materials, drug discovery, cognition and human behavior, cryptography, finance and markets are some of the important areas that benefit from modelling.
Nov 8, 2018 • 11 tweets • 3 min read
This work by a postdoctoral fellow and a renowned astrophysicist, alluding to the finite possibility that the unusual acceleration of the space object "Oumuamua" could belie an intelligent, extraterrestrial (yeah, ALIEN) origin has upset community 1/n

m.phys.org/news/2018-11-o… The manuscript to appear in the Astrophysical Journal Letters is this: Shmuel Bialy and Abraham Loeb, "Could Solar Radiation Pressure Explain 'Oumuamua's Peculiar Acceleration?" 2/n
arxiv.org/abs/1810.11490