Although not visually very active (clouds again!!) the Perseids were very prominent in the radar data. In my post mid august the data showed a maximum daily rate of 313 on the 13th with a maximum hourly rate of 28 between 2-3am on 12th, and as the hourly plot showed the main activity was between 2 – 8 am hence missed by lots of people even if clear, Ed and Dave at Solarfest went to bed too early!!
The meteor count total for the month was 2999, with an average daily count of 97 and average hourly rate of 4.
The hourly and daily plots are below and for comparison below these the August daily count for the last 3 years, interestingly the shower peaked on the 13th in 2018, 2017 but on 12th in 2016, this however is only the daily count and a different set of conditional actions for recording events is now in use.
The final chart is a reposting of the 2018 shower data.
The Perseids have been and gone, maximum hourly count was 28 between 2-3 pm on the 12th and the max daily count was 313 on the 13th. The hourly plot between 10th and 16th shows the daily shower distribution quite clearly, maximum activity picking up for 2pm onwards on most days , hence not many being seen, also the majority of counts were of low duration, so most not very bright, there were some longer duration signals associated with fireballs but not many and certainly not bright enough to trigger the all sky camera which I had running when sky was clear.( which wasn’t very often)
Monitoring of meteor activity using the reflection of the Graves radar signal with the fundongle pro+ shows a gradual increase in the daily count since start of month ( 78), up to 109 for yesterday and the maximum hourly rate has now risen to 15, also noticeable is the higher frequency of longer duration events, that could indicate fireballs such as this trace below. The peak is due on the eve of 12/13 Aug but also possible to view on 11/12th , however forecast is not good for either night !! However with the increase in activity and higher incidence of long lasting trails it might be worth having a look on the eve 10/11th as at least it is supposed to be clear!
“Although the July radiants do not individually produce strong rates, activity from the Aquarius and Capricornus regions in July and early August, as well as minor activity from other radiants, cause hourly rates to basically rise between the middle and end of July for observers in both the Northern and Southern Hemispheres.” ( http://meteorshowersonline.com/july_radiants.html)
The total number of meteors detected in July (2018) was 1824, with a mean daily rate of 59 and mean hourly rate of 2.5.
The maximum daily rate was 87 on the 26th July and the maximum hourly rate was 11, between 3-4am on the 27th and 30th.
The daily and hourly rates are shown in the first two charts below
These maxima coincide with the SDA shower and the trends over the month reflect the observation quoted at the start of this post. The trend of increasing activity towards the end of the month is borne out in the last chart below which compares the data over the last three years, the suggested trend is more pronounced in the 2016 and 2017 data than this year .
The Perseids are already with us peaking on the night of the 12/13th August, and with a new / very young moon there should be good viewing conditions as long as the clouds stay away.
No major activity in June , the June Lyrids the most active around the 15th/16th of June, the peak is distinguishable on the daily count plot. The peak activity around the 10/11th, is probably the combination of the Theta Opiuchids and Saggitariids. The rest of activity during the month a combination of the many minor showers present.
The dip in the daily rate on the 6th is due to Graves being off line between 01-05 hrs. The activity has dropped of to about 50 meteors / day towards end of month and has continued at this rate into July which is a relatively “quiet” month.
The plot is similar to the daily plot from 2017, although rates lower( this is probably dependent upon the density of the debris field the earth passes through )
I’ve listed the showers for June below as are the daily and hourly plots for June 2018 and the daily plot for June 2017.
The main shower in April is the Lyrids, but as the table below shows there are other showers present as well.
The total meteor activity detected for April was 1790.
The average daily rate was 60 and the average hourly rate 2.5
The max hrly rate was 11 during the hours of 9 & 11 on 30th April
The max dly rate was 93 on 23rd April with hourly counts of 10 during the hours of 4, 9 & 11.
Maximum activity for the Lyrids occurred during daylight as did a lot of this months activity.
The daily rate graph and hourly rate graph are listed below, the Lyrid max is marked on both, the daily rate for 2017 is also included for comparison, it would appear more meteors were detected this year. The month of May brings the Eta Aquarids over the weekend of the 5th/6th, which will be competing with a bright waning Gibbous moon.
March is not blessed with a conspicuous meteor shower but there are plenty of minor showers overlapping.
||February ??-April ??
The total meteor activity recorded for the month using the fundongle pro+ on the Graves frequency was 1116, there was a daily average of 36 with an hourly average of 1.5 The maximum daily count was 60 recorded on 19th March as was the max hourly count of 13.
This peak activity coincided with the peak activity of the Beta leonids, delta mensids and eta Virginids. Other minor peaks can be identified using table above.
A post on the UK Radio Meteor discussion group on the 19th flagged up a long duration event picked up by an observer at Emsworth in Hampshire., I didn’t find any visual reports of this daytime event.
Checking my logs this event had also been recorded at Barton, although spread across two screens.
The event was also recorded in Lincoln ( note the vertical, rather than horizontal waterfall screen)
Also recorded in Loughboro’
April is now with us and as well as several minor showers there is the Lyrid shower to look forward to over the 21/22 of the month , peak 11:00 – 22:00 BST on 22nd April. Moon in its first quarter should not cause any problems and for Lunar observers the Lunar X and V are at peak visibility around 21:40 BST on sun22 April.
February is not noted for its meteor showers, only a handful of minor showers and some daytime showers.
The radar reflections using Graves, gave a total count of 1140 meteors, with an average daily count of 41 and average hourly count of 2 (1.7), the max hourly count observed was 7 and max daily count 62. The contributions to activity from the Centaurids , Leonids and Capricornids are discernible on the charts below. March is another month of no notable shower, but lots of minor showers.
The main meteor activity this month around the 3rd/4th of January with the Quadrantids peaking in the early hours of the 4th Jan. Graves decided to go off line between 09:00 and 15:00 on the 3rd Jan. ( see red block on hourly plot).
The average hourly rate during the month was 2.2, with an average daily rate of 52.3. The variations during the month are due to the combinations of minor showers during the month, these are listed in table below.
I omitted the total count for 2017 in my new year post, this was 16,727with an average daily count of 46. It will be interesting to see what Andy’s magnetic collector picks up over the year.