David Holland

[David Holland @dfholland]

@wfaaweather So, people farther south can see the aurora. Maybe the quote was referring to field changes that take place when aurora can be seen at lower latitudes, not necessarily that the mag field is weakest overall at the poles as per your graphic.

[David Holland @dfholland]

@wfaaweather I also think there is a contextual issue with the NOAA quote. Usually aurora are confined to the poles where the magnetic field is strongest. Disturbances relatively weaken the magnetic field at the poles, so that the field lines intersect the atmosphere at lower latitudes.

[David Holland @dfholland]

@wfaaweather Pete. Several factual errors in your aurora piece. Earth’s magnetic field is strongest at poles. The charged particles from the sun are captured by the earth’s magnetic field and move along magnetic field lines to the poles, where they strike the atmosphere causing the aurora.

[David Holland @dfholland]

#CFA26atPCL

[David Holland @dfholland]

#CFA26atPCL

[David Holland @dfholland]

@alexa99 Mushroom

[David Holland @dfholland]

Marcel Proust, Love, and…Trump by @Gerald_Weaver_ https://t.co/rXH4F3J39s

[David Holland @dfholland]

@realDonaldTrump Commanders in Chief.

[David Holland @dfholland]

@NotUrAverageAng @LSUfootball Is it just me, or doesn’t this sound like Farmer Fran doing a prime time after-game interview? #WaterBoy #LSUvsTEX #LSUFootball

[David Holland @dfholland]

⚡️ “Hundreds of golden retrievers gathered to celebrate the breed's 150th anniversary”

https://t.co/eMD4OKl6xn

[Amy Brauer @amybrauer2]

Math workshop in action! Learning addition fact strategies @GPMaire @GPSchools

[David Holland @dfholland]

We don't brag enough in education, and we pay the price dearly. Eric Sheninger #BISDgps

[David Holland @dfholland]

When you focus on the learning the technology becomes invisible. @E_Sheninger #BISDgps

[David Holland @dfholland]

Leaders model embracing a vision and moving an agenda forward despite adversity.

[David Holland @dfholland]

Are my students learning? Can I be mere effective? Can I be more efficient? #BISDgps

[David Holland @dfholland]

Specific and intentional. #BISDgps

[David Holland @dfholland]

#BISDgps