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High cloud ice crystals cause: solar halo, corona, sundogs

San Diego's most colorful liquidambars

Solar corona
Solar corona

Atmospheric Ice-Crystal Effects are often observed, starting this time of year, because of the frequent appearance of high clouds made of tiny bits of ice. The most familiar of these optical effects is the 22˚-radius halo, or ring, around the sun or the moon. Less often seen is a “corona” (a colored disk around the sun or moon — not the same as the solar corona seen during total eclipse), “sundogs” (colored arcs left and right of the sun), the sun pillar (a vertical column of light above the rising or setting sun), and a host of other rare and inconspicuous optical phenomena. All of the optical effects mentioned are a consequence of sunlight or moonlight refracting through or reflecting from the tiny facets of ice crystals in cirrus and other types of high clouds.

Most liquidambars in our area regain their light green foliage by late February.

Liquidambar Trees, or sweet gums, the deciduous trees gracing front yards, parks, and campuses throughout the San Diego area, have been putting on an exceptionally colorful show. The leaves of some varieties turn to purple or red; the leaves of other varieties fade to golden yellow. Still other varieties hold on to their green leaves until sometime in December. Most liquidambars in our area regain their light green foliage by late February.

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La Jolla Shores on the way to Torrey Pines State Beach during low tide

Very Low Tides early this month coincide with good times of the day for tidepooling: Thursday, December 4, at 3:43 pm (-.87 feet); Friday at 4:30 pm (-1.15 feet); Saturday at 5:21 pm (-1.17 feet); and Sunday at 5:17 pm (-.97 feet). Very high tides will also occur within that string of days: Thursday at 9:02 am (+7.05 feet); Friday at 9:36 am (+7.29 feet); Saturday at 10:14 am (+7.31 feet); and Sunday at 9:55 am (7.08 feet).

Comet Leonard passes M3. Comet Leonard (C/2021 A1) will probably brighten to 6th magnitude by Thursday night. It will be high in the east before the very first light of dawn, crossing the Canes Venatici/Bootes border. North Americans looking on late Thursday night will find it less than 1° below the 7th-magnitude globular cluster M3. Quite an interesting visual comparison to be made, and think photo opportunity!

The above comes from the Outdoors listings in the Reader compiled by Jerry Schad, author of Afoot & Afield in San Diego County. Schad died in 2011. Planet information from SkyandTelescope.org.

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Solar corona
Solar corona

Atmospheric Ice-Crystal Effects are often observed, starting this time of year, because of the frequent appearance of high clouds made of tiny bits of ice. The most familiar of these optical effects is the 22˚-radius halo, or ring, around the sun or the moon. Less often seen is a “corona” (a colored disk around the sun or moon — not the same as the solar corona seen during total eclipse), “sundogs” (colored arcs left and right of the sun), the sun pillar (a vertical column of light above the rising or setting sun), and a host of other rare and inconspicuous optical phenomena. All of the optical effects mentioned are a consequence of sunlight or moonlight refracting through or reflecting from the tiny facets of ice crystals in cirrus and other types of high clouds.

Most liquidambars in our area regain their light green foliage by late February.

Liquidambar Trees, or sweet gums, the deciduous trees gracing front yards, parks, and campuses throughout the San Diego area, have been putting on an exceptionally colorful show. The leaves of some varieties turn to purple or red; the leaves of other varieties fade to golden yellow. Still other varieties hold on to their green leaves until sometime in December. Most liquidambars in our area regain their light green foliage by late February.

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La Jolla Shores on the way to Torrey Pines State Beach during low tide

Very Low Tides early this month coincide with good times of the day for tidepooling: Thursday, December 4, at 3:43 pm (-.87 feet); Friday at 4:30 pm (-1.15 feet); Saturday at 5:21 pm (-1.17 feet); and Sunday at 5:17 pm (-.97 feet). Very high tides will also occur within that string of days: Thursday at 9:02 am (+7.05 feet); Friday at 9:36 am (+7.29 feet); Saturday at 10:14 am (+7.31 feet); and Sunday at 9:55 am (7.08 feet).

Comet Leonard passes M3. Comet Leonard (C/2021 A1) will probably brighten to 6th magnitude by Thursday night. It will be high in the east before the very first light of dawn, crossing the Canes Venatici/Bootes border. North Americans looking on late Thursday night will find it less than 1° below the 7th-magnitude globular cluster M3. Quite an interesting visual comparison to be made, and think photo opportunity!

The above comes from the Outdoors listings in the Reader compiled by Jerry Schad, author of Afoot & Afield in San Diego County. Schad died in 2011. Planet information from SkyandTelescope.org.

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4S Ranch Allied Gardens Alpine Baja Balboa Park Bankers Hill Barrio Logan Bay Ho Bay Park Black Mountain Ranch Blossom Valley Bonita Bonsall Borrego Springs Boulevard Campo Cardiff-by-the-Sea Carlsbad Carmel Mountain Carmel Valley Chollas View Chula Vista City College City Heights Clairemont College Area Coronado CSU San Marcos Cuyamaca College Del Cerro Del Mar Descanso Downtown San Diego Eastlake East Village El Cajon Emerald Hills Encanto Encinitas Escondido Fallbrook Fletcher Hills Golden Hill Grant Hill Grantville Grossmont College Guatay Harbor Island Hillcrest Imperial Beach Imperial Valley Jacumba Jamacha-Lomita Jamul Julian Kearny Mesa Kensington La Jolla Lakeside La Mesa Lemon Grove Leucadia Liberty Station Lincoln Acres Lincoln Park Linda Vista Little Italy Logan Heights Mesa College Midway District MiraCosta College Miramar Miramar College Mira Mesa Mission Beach Mission Hills Mission Valley Mountain View Mount Hope Mount Laguna National City Nestor Normal Heights North Park Oak Park Ocean Beach Oceanside Old Town Otay Mesa Pacific Beach Pala Palomar College Palomar Mountain Paradise Hills Pauma Valley Pine Valley Point Loma Point Loma Nazarene Potrero Poway Rainbow Ramona Rancho Bernardo Rancho Penasquitos Rancho San Diego Rancho Santa Fe Rolando San Carlos San Marcos San Onofre Santa Ysabel Santee San Ysidro Scripps Ranch SDSU Serra Mesa Shelltown Shelter Island Sherman Heights Skyline Solana Beach Sorrento Valley Southcrest South Park Southwestern College Spring Valley Stockton Talmadge Temecula Tierrasanta Tijuana UCSD University City University Heights USD Valencia Park Valley Center Vista Warner Springs
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