AllhqFashion Womens Solid Imitated Suede HighHeels PullOn Round Closed Toe Boots Black 3VylduIlmB

B01NAJCA33
AllhqFashion Womens Solid Imitated Suede High-Heels Pull-On Round Closed Toe Boots Black 3VylduIlmB
  • Imitated Suede
  • Rubber sole
  • Shaft measures approximately 50 centimeters from arch
  • heel measure: 3 1/8"
  • Elasticity Neck
  • 100% High Quality; Condition: Brand New with Box; Made In China
  • Upper Material : Imitated Suede, Frosted; Lining Material: Velvet Lining
AllhqFashion Womens Solid Imitated Suede High-Heels Pull-On Round Closed Toe Boots Black 3VylduIlmB AllhqFashion Womens Solid Imitated Suede High-Heels Pull-On Round Closed Toe Boots Black 3VylduIlmB AllhqFashion Womens Solid Imitated Suede High-Heels Pull-On Round Closed Toe Boots Black 3VylduIlmB AllhqFashion Womens Solid Imitated Suede High-Heels Pull-On Round Closed Toe Boots Black 3VylduIlmB AllhqFashion Womens Solid Imitated Suede High-Heels Pull-On Round Closed Toe Boots Black 3VylduIlmB
AllhqFashion Womens Round Closed Toe Lowtop HighHeels Solid Imitated Suede Boots Brown W6vAF3CH1
Latasa Womens Cute Chic Polkadots Bow Platform Shoes Wedge Pumps Shoes Espadrille Shoes Light Blue AnG21cq

Online Programs

In partnership with the Office of Distance Learning

Main menu

Museum ofApplied Arts Sciences
Observations

By The Museum of Applied Arts Sciences

June 8, 2011

Share: Email this

An ejected prominence on the Sun on 21 May 2011. Image and copyright Harry Roberts ©, all rights reserved plus the Solar Dynamics Observatory for last panel

Most solar filaments end their lives by ejecting into space, and when this happens at the solar limb, H-alpha users see an impressive event – often termed an “eruptive prominence”. Terrestrial observatories seldom record such events, as they do not monitor prominences continuously, though with luck the satellite may get an image.

Most filaments erupt while on the bright disc (rather than the limb) where they are harder to see. In most filters they abruptly vanish (termed “disparition brusque”) because the filament’s ejection velocity causes a Doppler blue shift that exceeds the filter’s pass bandwidth. For instance a 0.7Å filter will be ”blind” to a filament ejecting at approach velocity >35 km/sec – a “low velocity” where the sun is concerned. By contrast, an ejection at the limb is not Doppler shifted, as the ejecta has almost no approach velocity.

2011 May 21st was clear and hazy with very good “seeing”. Many solar features were visible on the disc; spots, filaments etc, and at the SE limb a large faint “hedgerow” prominence. Timings showed the feature stretched around the limb from 36ºS to 52ºS (~200Mm length) and was about 37Mm (37,000km) high. These latitudes were higher than those of current sunspots, and showed that the filament (prominence) was a so-called quiet region filament (QRF) formed by weaker (~10 gauss) solar surface fields – and was not associated with any current sunspots, where fields are ~ 2000 gauss.

After ten minutes logging other features the “hedgerow” was seen to be erupting. At its northern end, where earlier the height was 37Mm, bright material had risen to 50Mm (arrowed x in Fig), with a faint plume reaching to 90Mm (a-a in Fig). The plume was visibly in motion, and over the next three minutes rose to 110Mm – when trees ended viewing. These numbers give an ejection velocity for the faint plume of over 100km/sec.- fast for a QRF that typically eject at 20-30km/sec.

The filament may have ejected entirely (all 200Mm of it) had it been visible for the next half hour or so, but trees hid it. A web search showed the SDO satellite EUV 171 Å channel had logged the event – confirming my record, but not showing if the ejection was total or partial. The SDO image, when enhanced, faintly showed the taller plume, dark against bright corona (a-a in Fig). Signs of a spot group behind the limb were noted ~15º north of the prominence (the future AR11223 site, AR? in Fig). There appear to be no other records of the event.

This was not a major ejection – far from it; but it reminds us that filaments eject from the sun on an almost daily basis at current activity levels. Having done so, a QRF will quickly reform, and it’s not unusual for part of a filament to erupt while the rest ‘stays put’. Nevertheless, it was exciting to watch, and reminds us that the sun, in H-alpha, is always active.

Nike Womens Internationalist JCRD Winter Trainers 859544 Sneakers Shoes Metallic Mahogany 900 P4BmzlHbo
| 54 Comments

By Tetley Tea Mens Slippers Navy Various Sizes bqwNcM7
on July 4th, 2018 at 8:14 am

Happy Independence Day!

Riding a bike gives us independence from so many things. Bicycles are freedom machines that allow us to go where we want, when we want — and the only fuel they require is our own muscles.

Hope you get a chance to ride today — whether that’s to a street party, parade, BBQ, or whatever.

We’ll see you back here tomorrow morning.

Mootsies FRESHEE Black Dist 75 Dark Brown l6cKZaK
| Comfity Boots For Women Womens Almond Toe Chunky Heels Gorgeous Velvet Shoes Side Zipper Ankle Boots Gray imPN7U3

By Aisun Womens Warm Waterproof Round Toe Thick Sole Platform Slip On Low Heels Dress Mid Calf Snow Boots Shoes Orange zlU4hpAgS
on July 3rd, 2018 at 12:12 pm

WashCo Bikes’ new logo and new ED Joe Kurmaskie (as seen at an anti Columbia River Crossing rally in 2009).(Photo: Jonathan Maus)

Bike advocacy on the other side of the west hills from Portland has gone through a lot of changes in the past few months.

The nonprofit Washington County Bicycle Transportation Coalition changed their name to WashCo Bikes back in May and this week they’ve announced their first-ever executive director. BalaMasa Girls Assorted Color Rain Frosted Sandals Blue AXPMWzEZa

By Madi Carlson (Family Biking Columnist) on July 3rd, 2018 at 11:19 am

Trailer bikes are great for when they’re too big for balance bikes but not yet ready to be on their own. (Photo: Jonathan Maus)

Our Family Biking column is sponsored by Clever Cycles .

➤ Read past entries .

I was taught to bike the old-fashioned way. My mother tossed me and a little red bike off the end of the pier by our house and I pedaled with all my might for land — and I was a competent bicyclist by the time a wave swept me onto the sandy shore. Or something like that.

Kids these days have it much easier with lots of nifty options that don’t involve the Pacific Ocean, avoid scraped elbows and knees, and aren’t uphill both ways. This week I’ll share what I’ve learned about balance bikes, tricycles and trailer bikes. ENMAYER Womens Synthetic High Heel Pointed Toe Pumps With BowKnot Beige TktX0ddAO

Front Page | 11 Comments

Advertisement

By Jonathan Maus (Publisher/Editor) on July 3rd, 2018 at 9:06 am

Latest iteration of how TriMet will design eight new stations on outer SE Division.

After months of feedback from partner agencies and advisory committees, and “recalibrating” due to a budget shortfall, TriMet has released its latest designs for how bicycle riders will pass through its new bus stations as part of the Division Transit project. An online open house went live last week and is accepting public comments through July 12th.

Say hello

La Sportiva Mutant Womens Trail Running Shoes SS18 Ultra Raptor Black/Yellow Talla 395 9PHVOiX
+44 (0)1273 741493

11 Jew Street Brighton East Sussex BN1 1UT

Quick links

Follow us

Google award for the Outstanding Use of Technology in the Field of Bias and Diversity



© Do Something Different 2018

* We are pleased to share success stories, but Do Something Different may not work for everyone, all the time.